@Xour Yes, you can. Take a look at this:Apparently I cannot edit the post. (...)
https://forums.elderscrollsonline.com/en/discussion/152598/how-to-edit-your-thread-first-postMissBizz wrote:I have heard from many people you cannot edit the initial post that creates the thread, I looked into it and also thought this. It IS possible though.
1. Look in "Recent" or "General Discussion" or wherever your thread is located. DO NOT click to open your thread.. just find it.
2. Hover over your thread title
3. A gear icon will appear to the left of the title (where it usually shows an icon such as an envelope or poll)
4. Edit away!
Hopefully this helps others out!