On a Mac, download and install the GPG Keychain application. Download the keypair file from the Support vault. It's attached to the 'email@example.com PGP Keypair' item. Open the GPG Keychain application and import the keypair file. It will ask for a password. Use the password saved on the vault item.
Now you will be able to encrypt, decrypt, and share the public key with others.
Right-click on the key in the GPG Keychain application and click 'Export'. Ensure the dialog box does not have 'Include secret key in exported file' checked. Save the exported file and send it to the requestor.
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If the encrypted data comes to the security email as text, decrypting is very easy. Copy the entire block of encrypted text, right-click, go to 'Services', then 'OpenPGP: Decrypt Selection to New Window'. After a few seconds a new window will appear with the decrypted text.
If the encrypted data comes as an attachment, start by downloading the file to your workstation. Navigate to the file in your Finder. Right-click the file, go to 'Services', and choose 'OpenPGP: Decrypt File'. The decrypted file will be placed in the same directory as the encrypted file. It may have a different name, though.