Перед отправкой заявки поставь галочку в этом поле.

Because перед normally requires the instrumental case when it means before.

• отправка = sending / submission
• instrumental singular of отправка → отправкой

So:

• перед отправкой = before submitting / before the submission

The ending -ой is a normal instrumental singular ending for many feminine nouns.

Here заявки is in the genitive case because it depends on the noun отправка.

Think of it like:

• отправка заявки = the sending of the application
• literally: submission of the application

In Russian, when one noun is linked to another like the submission of the application, the second noun is often put in the genitive.

So:

• заявка = application
• заявки = of the application

If you said отправить заявку, then заявку would be accusative, because it would be the direct object of the verb отправить.

Поставь is the perfective imperative of поставить, while ставь is the imperfective imperative of ставить.

In this sentence, the speaker is telling someone to perform one complete action:

• поставь галочку = put a check mark / tick the box

Perfective is very common in instructions when the focus is on a completed result.

Compare:

• поставь галочку = tick it once; complete the action
• ставь галочку = more like be putting / put it as a general habit / keep putting

For a one-time instruction on a form, поставь is the natural choice.

It is informal singular — used when speaking to:

• one person
• in an informal setting
• or sometimes in very direct instructional language

The formal or plural version would be:

• поставьте галочку в этом поле

So if this is a UI instruction aimed politely at users, поставьте may sound more standard. But поставь is still grammatically fine and might be used in a more casual tone.

Галочка literally means a little check mark / tick mark.

It comes from галка, but in modern usage галочка is the standard word for the kind of check mark you put in a box on a form.

In context:

• поставить галочку = to tick a box
• literally: to place a check mark

This is a very common expression in Russian interfaces and instructions.

Because поставить галочку is the normal idiomatic way to say tick/check the box.

A few related expressions are:

• поставить галочку = put a tick/check mark
• отметить = mark/select
• проверить = check/verify, but usually not tick a checkbox

So if you are talking about a checkbox on a form, поставить галочку is very natural.

Russian usually uses в поле for a field or box in a form/interface.

Here поле means:

• a form field
• an input area
• sometimes a box/space on a document

So:

• в этом поле = in this field

Using на would sound wrong here in standard Russian.

Often, yes. Поле has several meanings, including:

• field, as in open land
• field, as in a form field or text field
• area/space on a page or screen

In this sentence, it clearly means a field/box on a form or interface, not a literal outdoor field.

It is a prepositional phrase meaning before submitting the application.

Breakdown:

• перед = before
• отправкой = submission / sending (instrumental after перед)
• заявки = of the application (genitive after отправка)

So the whole phrase is literally:

• before the submission of the application

But natural English usually says:

• before submitting the application

Russian word order is flexible, and putting this phrase first highlights the time condition:

• Before submitting the application, ...

This is very natural in instructions. The sentence first sets the context, then gives the command:

1. Перед отправкой заявки = before submitting the application
2. поставь галочку в этом поле = tick this box

You could rearrange parts of the sentence, but this order is clear and standard.

Yes, that is close to the literal structure, but it sounds unnatural in English.

A more natural English translation would be:

• Before submitting the application, tick this box.
• Before sending the application, check this box.

Russian often uses noun-based structures like перед отправкой заявки, where English prefers a verb form like before submitting.

Here are the basic forms:

• перед — preposition, before
• отправка — noun, sending / submission
• заявка — noun, application / request
• поставить — verb, to place / to put
• галочка — noun, check mark / tick
• поле — noun, field

And the forms used in the sentence are:

• отправкой = instrumental singular of отправка
• заявки = genitive singular of заявка
• поставь = imperative singular of поставить
• галочку = accusative singular of галочка
• этом поле = prepositional singular after в

Because it is the direct object of the verb поставь.

You are being told to do something to the check mark:

• поставь что? — галочку

Since галочка is a feminine noun, its accusative singular form is галочку.

So:

• nominative: галочка
• accusative: галочку

Not exactly.

• поставь галочку в этом поле specifically means put a tick/check mark in this field/box
• отметь это поле would be more like mark this field, which is less specific and may sound odd depending on context

If the interface element is a checkbox, поставить галочку is the most natural expression.

The most obvious change would be the imperative:

• informal: поставь
• polite/plural: поставьте

So the polite version is:

• Перед отправкой заявки поставьте галочку в этом поле.

That is probably what you would see in many official or customer-facing contexts.