Share the link or the code
The host can send guests the room link, like /r/CODE, or read out the 6-character code. Either one gets a guest into the waiting room.
Share a room
A room is just a link and a short code. Here's how inviting works.
Waiting room is on by default
Guests see a "Waiting to Join" screen until the host taps Admit. The host can also deny entry.
Guests: use /join
If you have a link, open it. If you only have a code, go to /join and type it in. The Join button stays disabled until the code field is filled.
Typos show "Room not found"
Codes are short and easy to mistype. If you see "Room not found," double-check the characters or ask the host to send the link again.