How to edit a post I've made

I urgently need to edit one sentence I wrote. I see loads of posts that have been edited by the user but I have no option to edit mine?

Could a moderator please PM me to help me it's so important to me, I would be very grateful - who are the mods here?

Thanks

Bump

Mods please let me know.

I will not be updating my dairy again unless you do.