Can not push my project from desktop to repository using GitHub Desktop

I have a GitHub repository that is out of sync with the code on my desktop (see attachment 1). So I need to push my desktop code to GitHub. I found this article: https://www.theserverside.com/blog/Coffee-Talk-Java-News-Stories-and-Opinions/How-to-git-push-an-existing-project-to-Bitbucket. In GitHub Desktop I opened 'Repository --> Open in Command Prompt' and performed the following:

cd D:\Award Tracking Application - restart 20240407\Award Tracking Application
D:
git init
git add .
git config --global user.email "xxxxxxxxxx@xxxxxl.com"
git config --global user.name "xxxxxxxxxxxr"
git commit -m "Add files to git before the Bitbucket push."
git remote add source https://Glyndwr@bitbucket.org/ATA_Team/gmat.git
git push -u -f bitbucket master

The push returned an error:

fatal: 'bitbucket' does not appear to be a git repository fatal: Could not read from remote repository.

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

So I returned to the GitHub Desktop to do the push (see attachment 2). However, that gave an error message that I needed to perform a fetch first (see attachment 3). So I clicked on "Fetch". Then retried the Publish. However the same error message that I needed to perform a fetch first is displayed.

I have checked the repository and the files that I need uploading from my desktop are not there.

Replace:

git push -u -f bitbucket master

with

git push -u -f source master