It requires 2000 Reputation to edit every where. If you asked the question then you should be able to edit it as well as any answers you have posted. I can edit some of the answers of to questions I have asked but it is marked as needing moderation. Which takes time for the community to come and approve.

[https://meta.stackoverflow.com/privileges][1]  

check 8th from the top.  
[https://meta.stackoverflow.com/privileges/edit][2]


  [1]: https://meta.stackoverflow.com/privileges
  [2]: https://meta.stackoverflow.com/privileges/edit