the program doesn't let me do anything

There seem to be an issue at the moment as many people experience it, Please see this thread
https://community.adobe.com/t5/adobe-express-bugs/failed-to-license-one-or-more-images/idi-p/1259412...

If you need your question to be added there, let me know and I'll transfer your question to this thread...
If the developpers come to a fix (which will be hopefully very soon) they're more likely to update the main thread.