Hello everyone!
New to the forum! Have recently deleted all my platforms and consolidated to TOS. I need help adding the code for background color in my watch list. TOS indicator, TTM wave, would like to have the cell go green when the number is positive and the cell go red when the number is below negative. I've tried, I know its simple but just can't figure it out. Any help would be appreciated!

I had a similar question.

Does someone have a script that would provide a background color if price is above a specified moving average?

maybe better luck at ThinkScripter Community Forum - Give Help, Get Help, Pay it Forward or www.hahn-tech.com or Robert Payne's Fun with ThinkScript
Good luck.

Thankfully I was able to find out how to do this:

input length = 21;
plot data = close;
def MovAvgExponential = Average(data, length);
AssignBackgroundColor( if data < MovAvgExponential then Color.RED else if data > MovAvgExponential then Color.GREEN else Color.BLACK);