We need a step by step guide to sign in first. Login with Accel.io -> Sign Up -> Click on Twitter Button -> Authorize the app -> THEN YOU MUST GO HERE http://handbook.accel.io/plays/how-to-build-a-startup-the-le... coz if return to http://www.startupplays.com/ it logs out. Click on Preview button (eye icon) -> Click on Add To Cart -> Its done. ??? Frustrating