How to add private room to LoRa Pager? #3691

The Ultra v7.14 Guide says:
"Rooms

There is a node type called a Room Server, which is a very simple bulletin board system, where you can post messages and others can read them at a later time. Is a very useful store-and-forward system, for leaving messages for others who may be offline. When you select a Room from home screen, you will initially be prompted to enter either the admin or guest password:"

But I don't see how to add the room. I have a text that has the key and guest password, but I don't see the room to begin with since it's private.

I'm using a T-Pager sx1262 running Ripple v12.