New member here, trying to come up to speed on learning how to use the platform.

I'd like to test the system described here:

I found the GlobalRotation strategy and played with it, but can't figure out a couple of things (at least a couple!):

1. How to pick the top 3 ETFs, rather than just the top 1 ETF? I see there is a "First" method but how to pick ETF(2) and ETF(3) in the ranking array?

2. How to implement the volatility criteria to make a ranking decision. I'm not yet clear on how to use any criteria to make buy/sell decisions. 

I know this is basic stuff, but I've got to start somewhere and would appreciate some pointers on how to do this.