Well it's pretty simple.... v4v.app is a simple website which works on desktop or if you're on mobile, load it up in the in app browser on Hive Keychain.

That lets you convert Hive or HBD into Lightning and the other way.

If you haven't heard about the Lightning Network I can suggest looking for the Wallet of Satoshi as a fun version to try out. Lightning is a solution to make Bitcoin transfers of relatively small amounts very quick. It's getting quite a lot of development and use especially in El Salvador and other places.