You need add a lightning address to your profile yet 😉
Not a lightning invoice which can be used only once.
Discussion
Can you recommend a simple method? What iOS lightning wallets support this?
The easiest way is to download Wallet of Satoshi.
Then click on “Receive” button and in upper right corner you’ll see your lightning address. Copy it to your profile.
Wallet of Satoshi is a custodial lightning wallet, so don’t keep much funds in there.