The edit sign is so you can go back and add or delete on your posts. We do have a edit sign on ours we can see, we cant see anyone elses. We cant edit anyone elses posts but our own. So everyone does have a edit sign next to their post. you just dont see that on your end, you only can see your own.
Each poster may edit his/her own posts. Since you can only edit your own posts, you wouldn't see the option on any other poster.
In my case, I am seriously spelling challenged. I don't usually notice my errors until AFTER I have hit the "reply" button. The edit function allows me to go in and correct those mistakes I see once my post is up. It also allows you to go in and add something that may occur to you after you have posted your reply.
teacuphouse and flicka, haven't you heard the old saying, "There is no stupid question except for the one you DON'T ask!" :) If we never ask questions, because we feel they are stupid, how will we ever learn anything? it took me many years and a lot of stupid questions to get to the point where I don't care if someone thinks it is a stupid question, if I don't know the answer I ask and hopefully people don't look down on that but if they do that is their problem not mine. We can not know everything now can we? !