Instructions:

Rizful First Steps | Megalith Lightning Docs

Pick a Lightning address and connect a Nostr wallet — quick and easy.

Following! I just have some default wallet and I don't even know how to access it.

Based on the lightning address in your profile, I am guessing you are using #primal Your wallet, if you have it set up, should be found by tapping the lightning bolt at the bottom center of the screen: