Ik klik nog eens op de link, maar in mijn browser verschijnt alleen een leeg venster.

Because with the subject ik, Dutch present-tense verbs usually take the bare stem:

• ik klik = I click
• jij klikt = you click
• hij klikt = he clicks

So klik is the correct ik form of klikken.

Nog eens means again, once more, or one more time.

So:

• Ik klik nog eens op de link = I click on the link again / one more time

A useful thing to know is that nog eens often sounds a bit natural and conversational, especially for repeating an action.

Compare:

• Ik klik weer op de link = I click the link again
• Ik klik nog eens op de link = I click the link once more

Both can work, but nog eens has a slight sense of trying again.

In Dutch, the verb is klikken op when you mean to click on something.

So the pattern is:

• klikken op iets = to click on something

Examples:

• Ik klik op de knop. = I click on the button.
• Ze klikt op de link. = She clicks on the link.

English sometimes drops on in everyday speech, but Dutch normally keeps op with klikken in this meaning.

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

This is just something you have to learn with the noun. Many borrowed words in Dutch are de-words, and link is one of them.

So:

• de link
• op de link

Maar means but.

It connects two main clauses that contrast with each other:

• Ik klik nog eens op de link
• maar in mijn browser verschijnt alleen een leeg venster

So the idea is:

• I click the link again, but only an empty window appears in my browser.

It shows that the second part is an unexpected or disappointing result of the first part.

This is due to the Dutch V2 rule in main clauses: the finite verb must come in the second position.

In the second clause, the speaker puts in mijn browser first for emphasis or natural flow:

• In mijn browser = first position
• verschijnt = finite verb in second position
• alleen een leeg venster = subject comes after the verb

So the structure is:

• In mijn browser verschijnt alleen een leeg venster.

This is completely normal Dutch word order.

You could also say:

• Alleen een leeg venster verschijnt in mijn browser.

That is grammatical, but less natural in this context.

The subject is alleen een leeg venster.

Even though in mijn browser comes first, that is just a fronted phrase telling you where something appears. The thing that actually appears is:

• alleen een leeg venster = only an empty window

That is why the verb is singular:

• verschijnt = singular
• not verschijnen = plural

Because the subject is singular:

• een leeg venster = an empty window

So the verb must also be singular:

• een leeg venster verschijnt = an empty window appears

If the subject were plural, you would use verschijnen:

• lege vensters verschijnen = empty windows appear

This is about adjective endings in Dutch.

Venster is a het-word: het venster.

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

• een leeg venster

Compare:

• het lege venster = the empty window
• een leeg venster = an empty window

So the rule here is:

• de-word with een: usually -e
  • een lege doos
• het-word with een: usually no -e
  • een leeg venster

Here alleen means only.

It limits what appears:

• alleen een leeg venster = only an empty window

So the sentence means that nothing useful appears — just an empty window.

Be careful: alleen can also mean alone, depending on context. But here it clearly means only.

Examples:

• Ik ben alleen. = I am alone.
• Ik zie alleen een leeg venster. = I only see an empty window.

In computer language, venster is the normal word for a window on a screen.

• een venster = a software/browser window

Raam usually means a physical window in a wall.

So:

• Het raam staat open. = The window is open.
  (physical window)
• Er opent een nieuw venster. = A new window opens.
  (computer window)

That is why leeg venster is the natural choice here.

Dutch often uses the present tense to describe actions happening right now, especially in narration or when explaining a live situation.

So:

• Ik klik nog eens op de link = I click / I’m clicking the link again
• ... verschijnt alleen een leeg venster = ... only an empty window appears / is appearing

In English, you might often use the present progressive:

• I’m clicking the link again, but only an empty window appears.

Dutch uses the simple present much more broadly than English does.

Yes. Browser is a very common borrowed word in Dutch, especially in technology contexts.

So:

• mijn browser = my browser

Dutch often uses English tech terms directly, though sometimes there are Dutch alternatives. In everyday usage, browser is completely normal.