I can't use my purchased subscription, now I can only use free trail. how can I fix that?

In addition to Maurice's suggestion, please make sure to login with the e-mail address associated with your membership, Casvdbosch.  There is no membership associated with the e-mail address you used to post in this public discussion forum.

It can take up to one hour for your purchase to process. Until then, the apps will continue to show the options for a free membership.

If an hour has passed and you still are in trial mode, then please try these steps:
» https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html

Logging out of the 'Creative Cloud desktop app' and back in again may help already 🙂