How can I switch to manual mode/manual master

The first button, in the second row (below the power button) is the mode setting for Manual master/ manual mode. The bed will announce which mode you are cycling through at the time of switch. Manual Mode will perform a massage at the designated areas without executing a prior spinal scan. Manual Master Mode will allow the user to select certain spinal sections such as Cervical (C1- C5) or Thoracic (T7 -T12)