From your 'My Hub' page (please see below)
Click on the 9 dots in the top right hand corner and then select 'Results'.
You can then click 'Update Measurements' from the left-hand side
You will have 3 different measurement options to pick from under the category 'Update Measurements' those being Weight & Circumference, Body Fat Measurements and Vital Stats.
For each, you will be able to add new measurements and see all previous data as seen below.
Just remember to hit the 'Save' button once you've entered new data.