Added cashu.me wallet to https://beta.iris.to . When you sign in as a new user, you're all set to send and receive zaps without configuring anything. It sets [npub]@npub.cash as your lightning address.

Haven't implemented zap button send via cashu yet, but you can copy the zap invoice and pay it in the wallet.
 https://image.nostr.build/46587e9d2fc0725ca2e1c00f2850fc8b3f2c248de797e3115a9be2803183f664.jpg