You must get a lnurl address you can use WoS it's easy to get one. Then use a client like Damus if you have an iPhone or Amethyst if you have Android. You log in with your passwords and in the profile settings you find an option that says tips with Bitcoin Lightning there you must enter your address as well as mine is. And that's it.

WoS -> #[4]​

Damus -> #[5]​

Amethyst-> #[6]