Roll 20 on the go

Hi, I'm looking to get into gaming via Roll 20, and I downloaded the iPad app for this, but then I discovered that the App is just a companion? and I still need a computer to join a game? Please tell me this isn't so and that I can join and play games via my iPad when I'm on the road. I can't afford to go and buy a laptop :(

This  roll20 table on a tablet wiki page should answer your initial questions about playing roll20 on your Ipad. The  roll20 app is a different horse and as you found out it is more of a companion than a full site. The free-to-use mobile tablet applications focused on player-specific portions of Roll20. The simplest summary of what these applications are aimed to do would be "things you hold in your hand" at an in-person gaming table.

Awesome, thank you.