How do I perform a cleaning cycle on the Breville Barista Express?

To initiate a cleaning cycle, insert the 1 CUP filter basket into the portafilter, followed by the supplied cleaning disc and one cleaning tablet. Lock the portafilter into the group head and place a large container under the spouts to catch water. Ensure the water tank is filled with cold water and the drip tray is empty. Press the POWER button, then simultaneously press and hold 1 CUP and 2 CUP buttons for about 10 seconds until all buttons light up solidly. The cycle will take approximately 5 minutes, after which 2 beeps indicate completion. (Page 23)