Add PostgreSQL packages for Debian the repository

hi
I am trying to add PostgreSQL packages for Debian to a unc workstation stuck on how to import the key and the correct settings in repository add.

would really appreciate assistance
I have the key no idea as to how to import have created the file etc/apt/sources.list.d/pgdg.list and added the line to the file
what is next please

thanks rich

Mastodon