git push errors

[Aglenn29]

Hi!
I really need some help with this. Ihave two Errors currently:
1)$ git commit -m "getting ready to push an example cachematrix file"
On branch master
Your branch is ahead of 'origin/master' by 3 commits.
(use "git push" to publish your local commits)

2. $ git push
   remote: Permission to Aglenn29/ProgrammingAssignment2.git denied to Aglenn29.
   fatal: unable to access 'https://github.com/Aglenn29/ProgrammingAssignment2.git/': The requested URL returned error: 403

Any ideas or help would be greatly appreciated!

Thank you!

[openarun]

Failed to save entry: On branch master Your branch is ahead of 'origin/master' by 2 commits. (use "git push" to publish your local commits) You are in a sparse checkout with 100% of tracked files present. nothing to commit, working tree clean

I get similar one here when trying to save any page.