You go to the "Tools" button on the top menu, then click on Body Tracker. When you update your weight, it will automatically change your ticker. Have fun!
~April~ 5'7"
2 Part DS BMI: S/C/G 59.3/33.5/24.9
Part 1: 3/14/11 HW/SW#1/SW#2/CW/GW
Part 2: 7/14/11 379/366/319/214/159