You need to create a calculated field which evaluates 'something' and returns either 1, 2 or 3.
IF SUM(Sales)>100 then 1 elseif SUM(Proffit)>200 then 2 else 3 end
Then you'd drag and drop this onto the color button on the marks card.
Tom is right.
You can follow his solution or you can also use a CASE on your field and do the same thing. Once you have your calculation ready, Place it on color shelf and you will get the formatting.