Long press on zap icon to set up nwc. Double tap zap icon to zap custom account.
Discussion
So if I'm no longer using primal, do I need to send my sats to a new lightning address?
I don't know.. Were you using the internal primal wallet?
If yes then you probably can't use it outside primal.
If you were using some other external lightning wallet you can just use it with #Amethyst.
Nostr Wallet Connect wallets are the most convinient as they allow one click zaps from nostr clients that support nwc (like amethyst).