It says that:

You may post new threads
You may post replies
You may not post attachments
You may edit your posts

But how on earth can I edit my posts??? I simply can't find any "edit" or similar button! Is it hidden somewehere or it's so obviously visible that I miss it?

 

You only have five minutes to edit a post. After you post something look at the thread....next to the "quote" option there should be an "edit" button.

 

 

that explains it.. I was having the same issue.