How to change the category title font ?

[Naan-Kadavul]

Hi All,

I would like to know how to change the category title font in forumhome ?

This is the font that i am using currently.

Segoe UI, Candara, Optima, Calibri, Euphemia UCAS, Lucida Grande, Lucida Sans, Georgia, Palatino Linotype, Verdana, Arial;

I want to change this to

10px tahoma, verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;

I know it can be done in Style manager - All Styles

And then whats the next step ??
Naan-Kadavul