Can't push to a remote repository on my github

[Kevin Rodrigue Shema BIVEGETE]

I am trying to push to a remote repository and it isn't working.

Here is the code I wrote trying to push:

git config --global user.name "I put my registered github username here"

git config --global user.email "I put my email here the same as that on my github"

git push -u origin master

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

The repository exists. Help out guys.

[David Simpson _David Simpson Apps_]

OK, GitHub is a little off topic, but here we go.

Make sure that you have configured an ssh key at https://github.com/settings/keys 

If you haven't, Atlassian have written an article on how to generate one here:

https://support.atlassian.com/bitbucket-cloud/docs/set-up-an-ssh-key/ 

If you have both of those things covered, then make sure that you have write permission on the repository.