Building a Random Chat App

I’m trying to build a web app that will allow users to chat with random people (like Omegle but text only). Right now I’m trying to figure out how to add two people to the same chat. Here’s an image of where I’m stuck. Basically I added me (the user who clicked the button to join a chat), but I also need to add the other person, but how do I add them?

search for users :random item

How does Bubble know what item is? What is item?

It is an entry

Okay so I have it like this, how does Bubble know what I want to define as item (I want item to be a random room that two people are joining)?