Paina painiketta, kunhan olet varma.

Paina is the second-person singular imperative of painaa, meaning press.

So the base verb is painaa = to press, and paina! means press! when speaking to one person.

Finnish often leaves out the subject pronoun in commands, so Paina already means you press / press! without needing sinä.

Painiketta is the partitive singular of painike.

Finnish objects are not always in the basic dictionary form. Here, the verb painaa normally takes a partitive object when you mean physically pressing something, because the action does not change or finish the object as a whole. You are just applying pressure to it.

So:

• painike = button
• painiketta = button, in the partitive singular

This is a very normal pattern in Finnish:

• painaa nappia
• painaa jarrua
• painaa painiketta

A learner may expect a direct equivalent of English press the button, but Finnish uses case marking instead of an article like the.

By itself, painiketta does not tell you whether the meaning is a button or the button.

Finnish has no articles like a and the, so that difference usually comes from context.

So Paina painiketta could mean:

• Press the button
• Press a button

In real usage, the situation usually makes it clear which one is meant.

Here kunhan means as long as, provided that, or so long as.

So kunhan olet varma means something like as long as you are sure.

It is not exactly the same as kun.

• kun often means when
• kunhan here introduces a condition

So this sentence is not simply talking about time. It is setting a condition: press the button only if / provided that you are sure.

Because kunhan is followed by a normal clause, not by another command.

• olet varma = you are sure
• ole varma = be sure

In the sentence Paina painiketta, kunhan olet varma, the second part means as long as you are sure. It describes your state.

If you said Ole varma, that would be a separate imperative command: Be sure.

So:

• kunhan olet varma = provided that you are sure
• ole varma = be sure

Finnish often leaves out subject pronouns when they are clear from the verb form.

The form olet already tells you the subject is you singular, so sinä is unnecessary.

Both are possible:

• kunhan olet varma
• kunhan sinä olet varma

But the version without sinä is more neutral and natural in most contexts.

Because varma is an adjective, and here it works as a predicate adjective after the verb olla.

• olla varma = to be sure / certain
• varmasti = surely / certainly

So:

• olet varma = you are sure
• olet varmasti... = you certainly are... or you are probably..., depending on context

In this sentence, the idea is about your state of certainty, so varma is the correct word.

Yes, it does agree with the subject, but here the subject is singular, so the basic form varma is correct.

The understood subject is sinä = you singular, so:

• sinä olet varma = you are sure

If the subject were plural, the adjective would change:

• te olette varmoja = you (plural) are sure

So varma is singular because the sentence is addressed to one person.

Because in Finnish, a subordinate clause is normally separated from the main clause with a comma.

Here:

• Paina painiketta = main clause
• kunhan olet varma = subordinate clause

So the comma is standard Finnish punctuation.

English punctuation can be a bit more flexible in similar sentences, but in Finnish this comma is normal and expected.

Yes, often you could.

• painike is a bit more formal or technical
• nappi is more everyday

So both of these can work:

• Paina painiketta
• Paina nappia

However, nappi can also mean a clothing button, while painike specifically means a push button / button on a device. Because of that, painike may sound clearer in technical instructions.

The word order here is the most natural and neutral one, but Finnish word order is fairly flexible.

Paina painiketta, kunhan olet varma is the normal way to say it.

You can sometimes move things around for emphasis, but not every alternative sounds equally natural. For a learner, this version is the best model to follow:

• command first: Paina painiketta
• condition after it: kunhan olet varma

So yes, Finnish can vary word order, but this sentence already uses the standard, natural order.