Verification of repositories

Please excuse my ignorance, but if possible I’d be very grateful for some help with a quick query.

Pages linking to f-droid repos sometimes include the following text:
“If you would like to manually verify the fingerprint (SHA-256) of the repository signing key, here it is:”
(… followed by the key, as per this example: DivestOS Official)

Could I please ask how I might go about manually verifying the key? Apologies in advance if this is obvious!

Settings/Repositories, click the repository you want to verify and scroll down to see the sha256