Hi I know this is easy for some engineers here, but just wondering if how I can make "MP1" at the first column be highlighted to yellow if MP1 data is equal to N/A, as shown in the image.
You should use iserror() rather than isna() as isna() wasn't implemented in earlier versions of excel I think. Basically does the same thing, but will be more compatible with different versions of excel.
I avoid using ISERROR because it encompasses too many types of errors. It obfuscates errors and mistakes by not being specific enough. Personally I have no interest in supporting my own spreadsheets on versions of excel earlier than what I use at work (Excel 2010), and if they don't work on those earlier versions I'm ok with that.