To start, keep the offset to 0 and the phase angle at 0.
Offset is a way to push the waveform up or down from the center line. At 0, the waveform will use both the positive swing and the negative swing to complete its cycle. At 100 it will only be a positive wave, and at -100 it will only be a negative wave. At 100 it also ceases to be an AC waveform and becomes a DC waveform. The above applies to normal wave forms that do not have offsets built into them already.
You can read more about it in great detail on page 153 of the current user guide. Section titled: Waveform & Offset
As for phase angle, unless you have specific use for this feature in an experiment for which you would then understand the full ramifications of what this does, it is best left at 0. Sorry I am not able to at this time explain this feature adequately here in this reply.
Suffice to say it delays the start point of the waveform. If configured incorrectly, it can result in wave cancellation which would render no waveform.
There are times when using a positive offset is what you may wish to do. I hope that after reading the section on waveform and offset that you will have the information you need to make this decision.
As for the F2 = F1 X # Hz, this is used to do software frequency addition or amplitude modulation (both single and dual side bands).
It only takes effect when you have enabled via the check box below the line and selected which of the 3 functions you wish to utilize.
If we set F2 = F1 X 64 Hz, then what we are saying is that Frequency 2 will equal Frequency 1 times 64 Hz.
The end result is Frequency 2 will be 64 times greater than the fundamental frequency from our frequency set.
If we set F2 = F1 X 11 Hz and enable Add F1 to F2, then we will generate a frequency that is 11 times the fundamental frequency at the same time.
So say you have in your frequency set two frequencies 10 Hz and 50 Hz.
When we go to generate 10 Hz, we will also generate 110 Hz (11th harmonic). When it moves to the next frequency, we will generate 50 Hz and 550 Hz (the 11th harmonic of 50).
For more details, please check the link: