move key from one machine to another

i have GPG installed on one machine and want to move it to a new computer. I can’t see how to do this - I can see how to backup my key, transfer it to memory stick etc. but what do I do with it on the new machine?

In the source computer, open the Keyring Editor. Right click on your private key(s) and select “Export Keys”. Each key will be exported to a separate file.

Move the exported key files to the destination computer and in the Keyring Editor choose “Keys” from the menu and then “Import Keys”. Select the exported key files you brought from the source computer.