Make an invite for your room
Paste your room's link from PeerChat, or its room key. You get a page like this one to send to anyone, even people who don't have PeerSky yet.
Anyone with a room's link can join it and read what is said there, so only send it to people you want in the room. The link stays in your browser: the code is made on this page, and the part of an address after # is never sent to a server.