The template is ready to use.You don't have to do anything because there is a Sweep Plan in HB Controller and when you start the simulation, RFpower variable will start to sweep.
For your intention, you should place another Sweep Plan to sweep RFfrequency as placed in the template.First priority belongs to RFpower then RFfrequency.You can also define RFfrequency in VAR block as Start-Stop-Step..( see how to do that..)
Note that the output dataset will be quite confusing and complex, be careful..