For your first couple measurements, you might need to tell QardioBase it is you. This way QardioBase will get better and better at recognizing you, even if your weight fluctuates or you haven't weighed yourself for a long time.
After your measurement, QardioBase will display the following:
At this point, you have already stepped off the scale and you can press the middle of the QardioBase firmly with your foot to move the pointer from Guest to your name. After doing this 1-3 times, QardioBase should start to immediately recognize it is you and only show your name.
If the pointer is left on Guest, the measurement will not be stored in your account.
This video shows how easy it is to select your name on the scale: https://www.dropbox.com/s/hwrqsge9ymjceao/VID_20151222_131034.mp4?dl=0