Maintenance for the week of August 3:
• [COMPLETE] ESO Store and Account System for maintenance – August 4, 5:00AM EDT (9:00 UTC) - 4:00PM EDT (20:00 UTC)
If it is the original post, the edit button is next to the title up top. If it is a reply, there is a little cog next to the post # on the right side. If you just posted, you may have to click the post number and let the page reload to see it.
Edit: Just wanted to add you won't see the cog unless you hover over your post with a mouse.