How to edit a post?

Just wondering how to edit a post? I don't see the "edit" button like I see normally beneath the post, and to the left of the "reply" and "reply with quote" buttons?

Is editing your post not allowed or am I just missing something?

Thanks

Edit- ok this is odd, I can edit this post because I see the button, but on older posts where the link is wrong, it doesn't give me the option to edit. Is there a time limit for editing?

I think there is a time limit on how long you have to edit your posts. Also, you typically can't edit once someone has replied.

Ok thanks, that would explain why I can edit some but not all. I just wanted to add some links. No biggie. Thanks for your help

There is a time limit after posting. Once the time limit has passed, you cannot edit.
I believe the time is 30 minutes.