SSH keys cannot be modified or updated. To change the keys, remove and add them again.
To delete the SSH key from the app configuration, click Actions ➜ Delete.
If the key is deleted, all repository references will also be removed. Repositories that don’t have the key associated to them will use the common keys by default.
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Next: Reconfigure Git repositories and SSH keys
More on Working with SSH keys
Adding and associating SSH keys
Removing SSH keys (this page)