For iPhone users:
Press and hold the Fitmo app icon until all the icons on the screen begin to shake. You should now see a small grey button with an 'x' in the top right of the Fitmo app icon.
A pop-up will appear on your screen. Select 'Delete', and the Fitmo app will be completely removed from your phone.
For Android Users:
Press and hold on the Fitmo app icon. You will then be able to drag the icon to the top right of the screen, to 'Uninstall'. The Fitmo app will be completely removed from your phone.
Depending on your OS version, the layout might differ.