The Steps are:
Select Preset - must show in the Presets/Chains box (lower middle of Preset tab).
Select Program - must show in the Loaded Programs box (lower left of the Programs tab).
Go to Settings tab, change Amplitude for Out1, then press the "Tab" key or click some other place in the page.
Go to the Control tab, click "Allow Generator Overwrite".
Click on a stopped generator - the box should be red or pink.
The Amplitude in the Control tab should then change to the set point from the Settings tab.
For more details, please check: