Does your account status appear as "Inactive"?
First of all double check if your most recent payment to Fitplan was successful. Check if you have received a receipt from Apple/iTunes, Google Play or Fitplan.
If your payment was successful, and your account still appear as inactive, then there's three possible ways you can solve this:
Option 1
- Log out of your account
- Close the app
- Log back in
Option 2
- Delete Fitplan
- Re-download it
Option 3
- "Restore Purchase" in the settings section of the app
- Log out
- Close the app
- Log back in