Hi I was to make a small edit to one of my older posts. Is this possible? Thanks.

NOPE! Once you post and someone else responds, IT'S OVER! As far as I know. You're gonna have to make another post with the changes.

As long as the edit doesn't affect the context of the post or any replies made thereafter you can always PM me and ask me to change it, and I can do it for you. The exception to edits after replies have been made are for Member Journals and threads in the Trading Post, where the thread authors can edit any of their posts at any time.