How Do I Highlight a Cell Based On Other Cells?

Mac Numbers version 5.1 (Yosemite)
I just need a simple formula that will highlight a cell based on the difference between two other cells.
Cell N9 would “fill” if P17>J17. I would adapt the formula to fit the other cells in column N.
Example: N1 would fill if P17-J17>=2 N2 would fill if P17-J17>=3 etc. (I guess P17-J17>=1 works for Cell N9)
I am new to formulas and don’t know the language…yet.
Any help would be appreciated.
Thanks!
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KingB84