How to allow users to delete and edit their Comments and Discussions???
There is a setting in the dashboard for that, so relax, sit back and rethink the impression of your wasteful punctuation.
Go to yourforum/vanilla/settings/posting and you can find it near the end of the options, titled "Discussion & Comment Editing"
it "Yet Another Gamification Application 1.1" hides editing star.
how to solve it?
Set the rank rights in Yaga settings.