You can view your STRAVA profile and your activities. If you wish to revoke access to your STRAVA account then you can do this here. Your preferences from STRAVA are displayed and respected within STRIVER. So if you want to change the displayed units from miles to km then go to the Strava website and change it there and it will flow down to Striver.
If there are any recorded activities that have not yet been uploaded then they will have the red upload icon next to them.