Zahtev je na Portalu eUprava.

• Zahtev = a noun, masculine singular, in the nominative case. It is the subject of the sentence.
• je = is, the 3rd person singular present form of biti (to be).
• na = a preposition, here meaning something like on / at.
• Portalu = the noun portal in the locative singular after na, because the sentence expresses location.
• eUprava = the official name of the portal/service.

So the structure is basically:

[subject] + [is] + [location]

Je is the present-tense form is from biti (to be).

This sentence is a normal Serbian equational/location sentence, like:

• Knjiga je na stolu. = The book is on the table.
• Marko je kod kuće. = Marko is at home.

So Zahtev je na Portalu eUprava. literally has the same pattern:
The request is on the eUprava Portal.

Also, je is an unstressed clitic, so it tends to appear in second position in the clause. That is why Zahtev je... sounds natural.

Because na here expresses location, and with location it takes the locative case.

The base form is:

• portal = portal

The locative singular is:

• portalu

So:

• na portalu = on the portal / on the website

This is a very common Serbian pattern:

• na sajtu
• na internetu
• na platformi
• na portalu

If the idea were movement onto something, Serbian could use a different case pattern, but here the request is already located there, so locative is used.

Because Serbian usually uses na with many digital platforms, websites, portals, and online services.

So Serbian commonly says:

• na sajtu = on the website
• na portalu = on the portal
• na internetu = on the internet

For an English speaker, this may feel similar to English on a website, on a platform.

Using u here would not be the normal choice in standard usage. With online services and portals, na is the expected preposition.

It is locative singular.

The noun is:

• portal — masculine noun

Its locative singular is:

• portalu

That form appears because the preposition na is expressing where something is.

A helpful comparison:

• portal = dictionary form, nominative
• na portalu = on the portal, locative

Because it is part of an official name: Portal eUprava.

In Serbian, when a word inside a proper name is declined, it changes case but keeps its capital letter because it is still part of the name.

So:

• Portal eUprava = nominative form of the name
• na Portalu eUprava = locative form inside the sentence

This is normal with proper names in Serbian.

Because in official-style naming, a brand or service name often stays unchanged when it follows a generic noun such as Portal.

So the phrase works like:

• Portal eUprava
• na Portalu eUprava

Only the generic noun Portal is declined here.

In less formal or different usage, learners may sometimes encounter brand names treated more flexibly, but in this official naming pattern, keeping eUprava unchanged is very natural.

Because Serbian has no articles like English a/an/the.

So zahtev can mean:

• a request
• the request

The exact meaning depends on context.

That is very normal in Serbian. Learners often want to know where the went, but it simply is not expressed with a separate word.

Yes, Serbian word order is more flexible than English, but not every order sounds equally neutral.

The most neutral version here is:

• Zahtev je na Portalu eUprava.

You could also hear something like:

• Na Portalu eUprava je zahtev.

But that changes the focus a bit. It can sound as if you are emphasizing where the request is.

One important thing to remember: the clitic je still wants to be near the second position in the clause, so word order changes are possible, but they follow clitic-placement rules.

In a full standard sentence, normally no.

• Zahtev je na Portalu eUprava. = complete sentence

If you remove je:

• Zahtev na Portalu eUprava

that sounds more like a title, label, heading, or note, not a normal full sentence.

So in ordinary prose or speech, keep je.

Yes, zahtev is masculine.

A useful clue is that many Serbian masculine nouns end in a consonant in the dictionary form:

• grad
• telefon
• portal
• zahtev

That does not tell you everything about a noun, but it is a strong pattern.

Here that matters because the noun agrees with je as a singular subject, and masculine nouns have their own declension pattern in other cases.