Hoi Dutchie to be,

Do you like to have a certificate after completing all the classes? This is what you have to do!

Important to state is that is a certificate just for you. It's not an official document that you can use for applying for a residence permit or for a job. For those purposes, you need to take the NT2 exams. For more info: https://www.staatsexamensnt2.nl/item/state-exams-dutch-as-a-second

But for here:

First, you have to make sure you completed all the classes. You can do this in the upper right corner where it says "complete and continue". You also need to "complete and continue" the introduction as well as the copyright and practice speaking sections (and this part as well).

After you've completed all of the lectures, you either will be redirected to the certificate page automatically, or you can go to "certificate" on the left side:

GEFELICITEERD! ;)