With purchased credits you can go into a private chat with the model of your choice, talk to her and get her to do whatever you want.
It costs five credits per minute for a private show with a model and 10 credits for a two babe show.
Clicking on any of the thumbnails takes you to that babe's cam and her chat.
You can get a good look at the model live and chat with her and everyone else in the room.
Their list of performers isn't the largest out there, though, and private shows can cost you a pretty penny.