Op die website kun je een nieuw account aanmaken.

Because website is a de-word in Dutch: de website.

For singular demonstratives:

• de-word → die
• het-word → dat

So:

• de website → die website
• het account → dat account

That is why the sentence has op die website.

Dutch normally says op een website for on a website.

This is very similar to English:

• on a website
• on the internet

Dutch:

• op een website
• op internet

So op die website is the natural Dutch choice here, not in die website.

It is still a statement, not a question.

The basic order is:

• Je kunt op die website een nieuw account aanmaken.

But Dutch often puts another element first for emphasis or style. When that happens, the finite verb still has to stay in the second position. This is the Dutch V2 rule.

So:

• first position: Op die website
• second position: kun
• then the subject: je

That gives:

• Op die website kun je een nieuw account aanmaken.

So the inversion is caused by word order, not by it being a question.

Yes. That is completely correct.

The two versions mean the same thing:

• Je kunt op die website een nieuw account aanmaken.
• Op die website kun je een nieuw account aanmaken.

The difference is mainly focus:

• Je kunt... starts with you
• Op die website... highlights that website

English learners often notice inversion and think something special is happening, but this kind of fronting is very normal in Dutch.

With je/jij, Dutch has some variation in the forms of kunnen.

A very common pattern is:

• je kunt
• kun je

So when the subject comes first, you often get je kunt.
When inversion happens, you often get kun je.

That is why this sentence has kun je.

You may also hear kan je in everyday Dutch. That is common too, especially in speech, but kun je is an excellent form to learn and use.

Here je means you.

In Dutch, je can be:

• the unstressed form of jij = informal singular you
• a more general you meaning people/one/you in general

In this sentence, it can easily be understood in a general sense:

• On that website, you can create a new account

So it does not have to refer to one specific person only.

Because kunnen is a modal verb, and with modal verbs the other verb usually goes to the end in the infinitive.

So:

• kun = finite verb
• aanmaken = infinitive at the end

Structure:

• Op die website / kun / je / een nieuw account / aanmaken

This is a very common Dutch pattern:

• Ik wil Nederlands leren.
• Zij moet morgen werken.
• Wij kunnen daar parkeren.

Because aanmaken is a separable verb.

Its full infinitive is:

• aanmaken

But when it is the main finite verb in a simple sentence, it splits:

• Ik maak een account aan.

With a modal verb like kunnen, the infinitive stays together:

• Ik kan een account aanmaken.
• Op die website kun je een nieuw account aanmaken.

So both are the same verb; the structure changes depending on the sentence.

In this context, aanmaken means to create, to set up, or to open an account.

So een account aanmaken is the normal Dutch expression for:

• creating an account
• setting up an account
• registering for an account

It is more idiomatic here than translating make directly as maken.

Because account is a het-word: het account.

With a singular het-word after een, the adjective usually has no -e ending.

So:

• een nieuw account
• een groot huis
• een mooi boek

But with de-words or with definite articles, you usually do add -e:

• de nieuwe website
• het nieuwe account

So:

• een nieuw account is correct
• het nieuwe account is also correct

Yes. Dutch uses account as a borrowed word from English, and it is very common, especially online and in tech contexts.

You will often see:

• een account
• het account
• accounts

So even though it looks English, it behaves like a normal Dutch noun in the sentence.

Yes. die website points to a specific website, usually one already mentioned or obvious from the context.

Compare:

• op een website = on a website, any website
• op de website = on the website
• op die website = on that website

So die adds a pointing meaning, like English that.