Mark as Answer your answer to your own question after enough votes
32241
Why must I wait two days before accepting my own answer?
53369
How to Give Credit for An Answer in the Comments
91466
Mark answer as favorite/star
39016
Inform new users if they can upvote an answer they accepted
16030
What to do when OP answers his/her own question in an edit?
47340
Add self-answer delay for all users
84428
Editing the question such that it answers itself
99174
Award extra points to answer?
119214
Minimum reputation for answering your own question should be higher than what is needed to ask
147115
Disallow downvoting other answers if I've posted my own
105542
Allow flagging a comment after upvoting it
95144
separate reputation for questions and answers
108460
Review first post / late answers: show other answers as well
70503
Add "Answer Later" Tab
153027
Quoting someones comment in own answer
76054
Add a message when posting to old questions with more than N answers
83234
Etiquette for answering your own question