Every community has an invite link you can share — something like interchathq.com/join/… — that takes the person straight to that community's join screen when they open it.
Anyone with the link can use it to join (or to request to join, if the community is private). If you'd rather invite someone directly instead of sharing a link publicly, you can add people you know from within the community.
You'll find a community's invite link on its info screen.
For how the link behaves if the person doesn't have InterChat installed yet, see A link didn't open the app.
