It's an easy change if you know the CSS needed.
Just add this line of CSS to your CSS Editor within your Tab Designer: label{color:#FFFFFF;}
The above CSS will change the color of your labels to white.
To use a different color other than white, replace "FFFFFF" with a different Hex Value.
For example, to use indigo instead of white, the code would look like this: label{color:#4B0082;}
For a handy Hex Value chart, check out this guide from w3schools.com: http://www.w3schools.com/cssref/css_colors.asp
This chart sorts different colors by color name, so it's a great guide if you're new to Hex Values.
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