I used to be able to edit peoples posts. I want to do it again (to change the $\mathcal P$ to $\wp$ in the thread) can someone fix this please?
Graduated sites have higher reputation requirement to access privileges. In particular, you need 2,000 rep for editing, where now you only have 1,820.
The privileges page https://math.stackexchange.com/privileges for how far you are away from reaching the needed rep.
See Promotion implies higher rep needed for privileges, and nobody has such on this site for a discussion on this issue.