It has to be a a #Lightning address — it will look like an email address, or a string that starts with “LNURL”. Not every wallet offers this feature. Here’s a post about it. 
nostr:note1kd42ypacnj5a7phxqh7mnn0hkh8q3uwk3qxlg3t3mmcd8yjwar9q7p0xrc