I can't edit or delete posts.
Only employees may delete a message
As far as editing, there is a "hidden, unknown to other users" threshold that must be reached before a non-employee is allowed to edit a message
What do you want edited or deleted?
A moderator can look at that.
You have only 28 posts so far, not enough to have earned the privilege to edit your own posts yet. That will come later when you have accrued more badges. The more you participate, the more badges you earn.
Hope that helps.