Conditional color formatting - overview

I have the same issue, for gauges.  I'm a novice, and cannot follow the instruction to "Review the following screen shots." I don't know what the screen shots are telling me to do.  Believe me, I wich I did!.  I need something like the following (I'm making some assumptions about what I THINK the scren shots are saying, but my confidence that I am correct is very low):  "1-Highlight the visual you want to conditionally format.  2-Go into Data View.  3-Click "Modeling." 4-Click "New Column."  Name it whatever you want.  5-... what do I do next? (if 1-4 are even correct).

I have 14 gauges on one page in a Desktop report.  Each gauge is associated with a KPI.  The arc in the gauge gets filled with the Actual result for the period (such as month or quarter), and a target is shown by a line going across the arc at the appropriate place.  I want to fill the arc with Green, Yellow or Red depending on the result against the target, and depending on the Year and Month a User slects from slicers.  A twist is that the target might be different from period to period (for example, the target might be set per month, rising each month to the year-end number in December).

Is this possible?  As I said, I'm a novice, but I need to deliver this.  I don't know DAX, so I need the specific code, where to put it, step-by step.  I realize this is a lot to ask, but if anyone is willing to help, I will certainly appreciate it.