Unknown function generator
I would assume that the output signal is between the Output HI and LO terminals, with the LO terminal being signal ground.  The waveform at that output will be as selected by the Waveform switch, and its level controlled by the Amplitude control.
The Auxilliary outputs will always produce their labelled waveforms, and will not be affected by hte Aplitude control.
The white Ground terminals will connect to the case which should be connected to the AC Safety Ground.
(This is onlyy an educated guess - I've never seen that device.)