Стендовый доклад находится у входа.

Here находится means is located / is situated.

So the sentence is not using находиться in the sense of to find oneself. It is a very common verb for stating location, especially in neutral or slightly formal Russian.

Grammar:

• находится = 3rd person singular present tense
• dictionary form: находиться

So:

• Стендовый доклад находится у входа = The poster presentation is located near the entrance

Russian normally does not use a present-tense verb meaning is in simple sentences like this.

In many cases, Russian simply leaves it out:

• Стендовый доклад у входа = literally Poster presentation near the entrance

But using находится makes the sentence more explicit and natural in a neutral/formal style. It sounds a bit like is located rather than just is.

Compare:

• Стендовый доклад у входа — shorter, more like a note, label, or very compressed statement
• Стендовый доклад находится у входа — full sentence, clear and standard

Because the preposition у requires the genitive case.

The noun is:

• вход = entrance (nominative)

After у, it becomes:

• у входа = by / near the entrance

So this is a case-governance pattern you simply need to learn:

• у + genitive

Other examples:

• у двери = by the door
• у окна = by the window
• у дома = by the house

У входа means by the entrance, near the entrance, or at the entrance.

It usually suggests something is positioned close to the entrance area, not necessarily inside the doorway itself.

A useful comparison:

• у входа = by/near the entrance
• около входа = near the entrance
• на входе = at the entrance point, often where entry is happening

In this sentence, у входа is the most natural way to say that the poster presentation is located by the entrance.

Because стендовый is an adjective modifying доклад, and it must agree with it.

Доклад is:

• masculine
• singular
• nominative

So the adjective also has to be:

• masculine
• singular
• nominative

That gives:

• стендовый доклад

Compare the agreement:

• masculine: стендовый доклад
• feminine: стендовая сессия
• neuter: стендовое сообщение
• plural: стендовые доклады

It is a set academic expression meaning a poster presentation or poster report.

Literally:

• стенд = stand, display board, poster board
• стендовый = related to a stand/display
• доклад = report, presentation

So стендовый доклад is the kind of conference presentation where the material is shown on a poster or board rather than delivered as a full spoken talk from the stage.

A native English speaker may notice that the literal parts do not map perfectly onto the standard English term. That is normal. In real usage, poster presentation is usually the best translation.

Yes. Russian word order is flexible.

You can also say:

• У входа находится стендовый доклад.

This puts the location first and can sound like:

• By the entrance is the poster presentation
• or more naturally in English, The poster presentation is by the entrance

The original order:

• Стендовый доклад находится у входа starts with the thing being talked about.

The alternative:

• У входа находится стендовый доклад starts with the place.

Both are grammatically correct. The difference is mainly one of emphasis and information structure.

Yes, but the difference is small.

• у входа = by the entrance, right at the entrance area
• около входа = near the entrance, perhaps a little less immediate
• возле входа = also near/by the entrance

In many situations, these are interchangeable. But у входа often feels especially natural when something is positioned right by the entrance.

Russian has no articles.

So стендовый доклад can mean:

• the poster presentation
• a poster presentation

Which one is intended depends on context.

Russian speakers understand definiteness from:

• the situation
• earlier mention
• word order
• general context

So the sentence by itself does not need an article.

The normal stress is:

• стендОвый
• доклАд
• находИтся
• у вхОда

So the whole sentence is pronounced:

стендОвый доклАд находИтся у вхОда

Stress is worth learning early, because Russian vowel pronunciation changes a lot in unstressed syllables.

The -ся ending marks the verb as reflexive in form.

The dictionary form is:

• находить / найти = to find
• находиться = to be located / to find oneself

In this sentence, though, you do not need to think of it as literally reflexive in English. It functions as a normal verb meaning to be located.

So the best way to learn it is as a whole unit:

• находиться где-то = to be located somewhere

Example:

• Музей находится в центре города. = The museum is located in the city center.

Not after у.

After у, you need the genitive, so it must be:

• у входа

Входе is the prepositional case, and it would appear after different prepositions, for example:

• на входе = at the entrance
• о входе = about the entrance

So:

• у входа ✅
• у входе ❌

This is a good example of how Russian prepositions control specific cases.