HI @Chava Draws
Welcome to the community!
If you are talking about bitbucket and SourceTree then i would say first of all you need to clone your bitbucket repo to local system using SourceTree and then you need to change/add the new code into the cloned repo.
Once you will add/changes done into the repo, source tree will automatically pick up the changes and then just you nee to commit and then push the code to remote bitbucket repo.
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