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Open TerminalTerminalGit Bash. 
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List the current configured remote repository for your fork. $ git remote -v > origin https://HOSTNAME/YOUR-USERNAME/YOUR-FORK.git (fetch) > origin https://HOSTNAME/YOUR-USERNAME/YOUR-FORK.git (push)
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Specify a new remote upstream repository that will be synced with the fork. git remote add upstream https://HOSTNAME/ORIGINAL-OWNER/ORIGINAL-REPOSITORY.git
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Verify the new upstream repository you've specified for your fork. $ git remote -v > origin https://HOSTNAME/YOUR-USERNAME/YOUR-FORK.git (fetch) > origin https://HOSTNAME/YOUR-USERNAME/YOUR-FORK.git (push) > upstream https://HOSTNAME/ORIGINAL-OWNER/ORIGINAL-REPOSITORY.git (fetch) > upstream https://HOSTNAME/ORIGINAL-OWNER/ORIGINAL-REPOSITORY.git (push)
Configuring a remote repository for a fork
You must configure a remote that points to the upstream repository in Git to sync changes you make in a fork with the original repository. This also allows you to sync changes made in the original repository with the fork.