Skica je u uputstvu.

Because after the preposition u meaning in, Serbian normally uses the locative case when talking about location.

• basic form: uputstvo = instruction / manual / guide
• locative singular: uputstvu = in the instruction manual / in the guide

So:

• Skica je u uputstvu. = The sketch is in the manual.

This is a very common pattern:

• u školi = in the school
• u knjizi = in the book
• u gradu = in the city
• u uputstvu = in the manual

It is the locative singular of uputstvo.

The noun uputstvo is a neuter noun ending in -o in its dictionary form. Many neuter nouns like this change to -u in the locative singular after u or o when expressing location or topic.

Examples:

• selo → u selu = in the village
• pismo → u pismu = in the letter
• uputstvo → u uputstvu = in the manual

So the ending -u here is showing the case.

The first u is the preposition meaning in.

The second u is just the first letter of the noun uputstvu.

So:

• u = in
• uputstvu = manual/instructions in the locative form

Serbian allows this normally, so u uputstvu is completely correct and natural. It may look awkward to an English speaker at first, but there is nothing unusual about it in Serbian.

Je is the 3rd person singular present tense of the verb biti = to be.

So in this sentence:

• Skica = sketch
• je = is
• u uputstvu = in the manual

Together: Skica je u uputstvu. = The sketch is in the manual.

In the present tense, je is used for he/she/it is. It does not change according to grammatical gender here.

Examples:

• Plan je gotov. = The plan is finished.
• Knjiga je ovde. = The book is here.
• Pismo je kratko. = The letter is short.

Yes, skica is a feminine noun.

A very common clue in Serbian is that many feminine nouns end in -a in the basic form:

• skica = sketch
• knjiga = book
• škola = school
• strana = page/side

That said, ending in -a is a strong clue, not an absolute rule for every single noun in the language. But for skica, feminine is correct.

You can see the gender more clearly when adjectives are added:

• Nova skica je u uputstvu. = The new sketch is in the manual.

Here nova shows feminine agreement with skica.

Serbian normally does not use articles like English a/an/the.

So skica can mean:

• a sketch
• the sketch

and uputstvu can mean:

• in a manual
• in the manual

The exact meaning usually comes from context.

So Skica je u uputstvu could be understood as:

• The sketch is in the manual
• A sketch is in the manual

In many learning materials, the English translation uses the because it sounds most natural in context.

Yes. Serbian word order is more flexible than English word order, although not completely free.

Skica je u uputstvu is a normal neutral order.

But you could also say:

• U uputstvu je skica.

This puts more focus on where the sketch is.

Very roughly:

• Skica je u uputstvu. = neutral statement
• U uputstvu je skica. = It is in the manual that the sketch is / The sketch is in the manual

The meaning stays basically the same, but the emphasis changes.

Yes. The preposition u often means in or into, depending on the case used after it.

With location (where something is), u usually takes the locative:

• u uputstvu = in the manual
• u sobi = in the room

With motion toward/into something, u usually takes the accusative:

• Idem u sobu. = I am going into the room.

So in your sentence, because the sketch is already located there, Serbian uses the locative:

• Skica je u uputstvu.

Uputstvo usually means something like:

• instructions
• instruction manual
• guide
• sometimes directions

The best English translation depends on context.

For example:

• pročitati uputstvo = to read the instructions / the manual
• uputstvo za upotrebu = instructions for use / user manual

So in Skica je u uputstvu, uputstvu most likely means in the instructions or in the manual.

A simple approximate pronunciation is:

SKEE-tsa ye oo OO-poot-stvoo

A few helpful notes:

• sk in skica is like sk in skill
• c in Serbian is pronounced like ts
• j in je is like English y in yes
• u is always pronounced like oo in food
• stress is not usually marked in normal writing, so learners typically pick it up by listening

So:

• Skica ≈ SKEE-tsa
• je ≈ ye
• uputstvu ≈ oo-POOT-stvoo or OO-poot-stvoo depending on accent

In a normal full sentence, no. You need je here because Serbian usually keeps the present-tense form of to be in this kind of statement.

So the standard sentence is:

• Skica je u uputstvu.

Without je, it would sound incomplete in ordinary prose or speech.

There are some special situations in headlines, notes, or very compressed style where words may be omitted, but for a learner, the safe and correct form is to keep je.