Put a help button on the login screen and in the left hand flyout menu with some explaining. That might be a good place to start.

As for help reply - super controversial suggestion - since you already add us to the Amethyst Users channel in the DM/channels menu - maybe add another column to the home screen for JUST that channel - or a new one called Amethyst Help

The Channels tab by default still going to free relays right?