"checked out the link you'd provided, and I understand the directions, but I do not understand what formula I would have to put into the description box in order to achieve the result I want."
Any formula that returns true.
If you set a format for green, that cell would be green. In the case of multiple formulas (i have nested 15 before), it is always the last True that wins. So if you are working with values, always inspect from Least to Most Significant.