Are you trying to register to Archetyp but don't know what to do after you get to the encrypted message screen?
Basically Archetyp upped the security for new accounts. They now require each account to have a valid Public PGP key. Also they will have 2FA enable by default.
When registering, the first thing you'll need to do is paste in your Public PGP key. Then fill the other info like usual. (remember PUBLIC, your secret key is for your eyes only)
After you click the cut circle, you will see a page with a encrypted message. This message is encrypted with your public PGP key and only you can decrypt it.
After you decrypt the message with your PGP program (Best option is Kleopatra) you will see instructions on how to go further.
Basically you just need to copy the full link in the decrypted message and replace the old link in your browser with the one you just copied.
Are you still lost on how PGP works? How to create a PGP pair and how to encrypt and decrypt messages?
The DNM bible is the place to be. This website explains that and more. There's a whole section dedicated to PGP.
You can find a link to the dnm Bible here: /d/DNMbible and also on /d/DarknetMarketsNoobs