Unable to edit the first post in a topic?

Hello, I need to edit the first post of one of my Work in progresses, for some reason the description suddenly went all out of wack from what i originally posted so i need to fix it but I am unable to edit it for some reason. (I most likely am being stupid and forgetting something but i wanted to just check and get it over with lol)

After a time, posts lock and prevent editing. You can either contact one of the @moderators to edit your first post on your behalf or to turn the post into a wiki, opening it for edits.

thank you, i think ive heard that before and just forgot lol.