Steps:

1. On the dashboard,press and hold Gear button (in red circle) until pop up SAC pin number required appear. Make sure the color of cloud          is GREEN (have internet connection)

2. Enter SAC to proceed (5638)

3. Select date from calendar

4. Click Resync

5. On the pop up, click Close App

6. Reopen the SlurpCentral App to do transaction as usual