I saw several questions about this, for example:
How to rename git branch name
But I am using TortoiseGit.
As you can see:

I recently renamed my local branch from ImportPTS to import-publictalk-names . I just pushed my commit from a new named branch to an existing remote branch with a name.
But I would like the remote named branch to match. Can we do this with TortoiseGit? I tried with the Ref browser window and could not see it.
source
share