Timechain on Nostr: After downloading the app, press "Receive" in the bottom left, and then the "Copy" ...

After downloading the app, press "Receive" in the bottom left, and then the "Copy" button to copy your LNURL to your clipboard. (Yours will be different than mine)

Your LNURL will look kinda like an email address. One that ends in @ walletofsatoshi