Add it to your outbox section (not to the inbox, since only paid users can post there). 

Keep the others in your General Relay list so that Amethyst can use them to download posts from your follows. Amethyst also shows Recommended relays at the bottom that comes from the Outbox list of your follows. 

 There is no section which says "Outbox Relays". Do you mean "Public Home Relays"? 

 yes, Outbox == home. I need to change the name :(  

 Np. Ty. Subscribed now and added.