Tap the gear icon (top left) to open 'Settings' -> select 'General'.
After that, tap 'Change password'
Finally, insert your current and new password. Then tap on 'Change Password'
In case you don't remember your current password, then you will need to reset it.
Note: If you signed up to Covve using Google or Apple login then Covve doesn't manage your password. You'll need to change it in Google or Apple respectively.