Can't login or use

I found Pocket Cloud from a friend but I am not very techy. I love the idea of being able to remote to my desktop but I'm having a ton of trouble. Down loaded app for my Xoom and installed on Windows 7 computer. Worked great first time. Went back to app and it couldn"t discover my computer.

Logged out and tried to log back on both tablet and PC and it won't even recognize my log in info. So frustrating. Any ideas?