What is this editing you speak of?
(I jest of course... probably you can edit it? If you see a three dots button in the upper right corner of your post, it is a drop down menu (so named because a menu drops down when you click/tap or otherwise select it, and editing is an option that appears there if they trust you to do so) does that help)
Oh wait, do you mean preview your post before you post it?
Good Question!
I don't know. But someone must, and maybe i can figure it out....