Just place your minibits.cash address in the LN address box of your nostr client.

Zaps of your notes will appear as an ecash balance in your minibits wallet because minibits has a built in LN to ecash bridge

Zap other notes in nostr client and approve in wallet

Or as your picture shows, you can send any npub ecash and it will appear as a token in their dm

Amethyst makes this easy because it populates the token with a simple redeem button