To sync changes you make in a fork with the original repository, you must configure a remote that points to the upstream repository in Git.
Open Terminal (for Mac and Linux users) or the command prompt (for Windows users).
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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)