Troubleshooting git push - it asks for a user/pass

What do you mean by previous repo? Check the url of the origin from the previous repo's .git/config file. If you had cloned using http, it will ask for user/pass.

this occurs because you did

git clone https://github.com/username/repo

instead of

git clone [email protected]:username/repo.git

Try the following:

git remote set-url origin [your git url, such as [email protected]:.../project.git]