How can I rename or drop the Discourse account?
If you don’t have the ability to rename yourself (you can go to your preferences to check it), your best bet is to message one of the discourse team members here and they will do it for you.
If by drop, you mean delete, that’s something you will have to discuss with them as well.
Thanks @Thomas_G Renaming will do fine. Who should I contact exactly?
One of these guys will definitely help you out: