Jerboa search only finds communities that at least 1 person on your instance subscribed to, to find new communities from other instances easily I like to use https://browse.feddit.de/
Then when you find a community, go to the web version of your instance (don't worry it's (mostly) mobile friendly) and type !name@instan.ce (don't forget the !) Then you can subscribe there. Close and reopen Jerboa and your new community will show up in the list. The Jerboa devs are working on fixing this.
Jerboa search only finds communities that at least 1 person on your instance subscribed to, to find new communities from other instances easily I like to use https://browse.feddit.de/
Then when you find a community, go to the web version of your instance (don't worry it's (mostly) mobile friendly) and type !name@instan.ce (don't forget the !) Then you can subscribe there. Close and reopen Jerboa and your new community will show up in the list. The Jerboa devs are working on fixing this.