I have acquired a used Proform exercise bike but it has no manual. I cannot find the model no. anywhere on the machine but the serial no. is TC734492-DI. The control unit has a large "reset" button on the left and a "mode" button on the right. The screen has "time" and "scan" on the left and "speed", "calorie" and "distance" on the right. I don't know what any of this does or how to use it and would really appreciate any help possible.