Before you use it, you will need to create an account and input some basic information about yourself.
Afterwards, proceed with calibrating the app for yourself – take 11 pictures of yourself in designated poses (the app will guide you which poses to take) plus 1 background picture.
When you complete the sign in and calibration procedures, the app is all set up and ready for use. From then on, you can take measurements at any time simply by following the in-app instructions.
Further measurements require only 4 photos plus 1 background photo. Don’t worry, you will be guided by the on-screen instructions within the app. For factors affecting measurement results, please see: Factors Affecting Measurement Results