If you have received a key file by email, you might want to import it into Passwords and Keys. In most cases, Passwords and Keys automatically imports PGP keys from your computer. You can also manually import a particular key, if it has not been imported already.
How do I manually import a key?
Select File▸ Import….
In the new dialog, select the key you wish to import. PGP keys end with pgp or asc, GPG keys end with gpg.
Click Open.
Once imported, the PGP and GPG keys are listed under GnuPG keys.
