If you have questions regarding a modification please post in the thread/site/forum from which you downloaded it. As the authors/other users will be ones best placed to assist you.
(If you haven't already done so you could try the following: )
AdminCP > Styles & Templates > Style Manager > Main CSS
Scroll to the bottom and find the second text area for Additional CSS Definitions
Place the CSS for the h2 tag in that box. (It may be that the h2 tag uses an additional class which is overwriting the font size itself).
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