The settings for Spectrum Sweep are located in page 78 (01 Feb 2016) of the User's guide. Also the complete explanation is located on page188 (01 Feb 2016).
The easiest way to use Spectrum, is with an specific tool created to facilitate the programming of a sweep.
"Create Spectrum Sweep" is very simple to use. You input the lower freq, then the upper freq, and the rest of parameters.