The videos play for anyone that wants to use SBTV mobile, however, to earn rewards you must first 'LOGIN' using the yellow login button on the top right of the app. Log in using your existing username & password for the web version of swagbucks.com. Once logged in your meter should start moving 'after' each video you watch. Furthermore, the 'meter' will NOT move if you are not logged in OR reached your daily WIN limit. Your WIN limit could be substantially less if you are sharing your IP address (home or work Wifi network) where other users are also watching SBTV OR are sharing your login with other users or on other android devices simultaneously.
If this does not answer your question, please submit a request to our support team.