Before adding a new GPG key to your account on your GitHub Enterprise Server instance, you should have:
GitHub Enterprise Server supports several GPG key algorithms. If you try to add a key generated with an unsupported algorithm, you may encounter an error.
When verifying a signature, we extract the signature and attempt to parse its key-id. We match the key-id with keys uploaded to GitHub Enterprise Server. Until you upload your GPG key to GitHub Enterprise Server, we cannot verify your signatures.
In the upper-right corner of any page, click your profile photo, then click Settings.
In the user settings sidebar, click SSH and GPG keys.
Click New GPG key.
In the "Key" field, paste the GPG key you copied when you generated your GPG key.
Click Add GPG key.
To confirm the action, enter your GitHub Enterprise Server password.