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I accidentally clicked OK when initializing the Git repository before editing the field, and it is now bound to a local location instead of the one over the Internet that I want. As far as I can tell, there is no way to revert this; even if I disconnect, I cannot choose to connect to a different repository. I cannot make much progress at all if I can't get my code online.
Go to your external file browser and delete .git folder that was created in the folder you accepted in the dialog. Then restart the IDE.