Molana,
To change text color in general, including in the plot legend of a graph or chart, double-click the text of interest to highlight it (sometimes it takes a triple-click) with either the labeling (text) tool selected or automatic tool selection enabled. There is a menu ring which usually reads "XXpt Application Font" on the toolbar near the top of your front panel window. Click the down arrow on the right side of the menu ring, which will break out all of your options to modify the text. One of the options is "Color", which will bring up the color palette when you place your cursor over it. Select your desired color from the palette and the highlighted text will change accordingly. Have a good day, Molana!
Sincerely,
Ross C
Applications Engineer