Hi Amy,
Thanks for your comment. Please let me know if this helps;

1) Click on the iGoogle link.

2) Click on the button "Add to Google"

3) Now you should see the virtual model. To customize it you need to go to the top right of the box and click on the little down arrow at the top there. This will enable you to 'edit settings' for your height and weight.

Please let me know if this works or at which stage you get stuck.

Thanks,
Meg