Just go to https://relay.tools/ and login, by clicking on the circle on the top-right. Then select "My Relays" and then click on TheForest. Then go down to the menu item Access Control Lists and you can edit the list, there, by entering people's npub or hexID.

 https://image.nostr.build/b2a992b1e656a505e923b7bbdd22a748dd68f19ac10c64c839c35e04fdd6aeb9.png