Those bikes are horrible! I work at a shop and occasionally we have the unfortunate task of trying to work on them. They are poorly made. We had one that had a bad rear wheel....good luck trying to find a replacement wheel that will use all the same components for the shifting system. (this was a different brand, but same concept....company was out of buisness so we couldn't get help from them)

Get a real bike and make it a quality one, you'll be so much happier in the long run. Even better, find a good local bike shop to help you figure out the whole shifting thing. It's really very easy once it's properly explained to you. Then pick out a nice hybrid bike from them and start enjoying it. I guarentee you will get much better performance this way, and you'll develope a nice relationship with your LBS who can help you should any problems arise.