Categores display

Our high school has a competition e-business site, and we use joomla/ hikashop. We are trying to figure out how to change the display of our categories when we click on one category with several sub-categories. Currently the sub-categories display vertically down from oneanother, but we would like them to be horizontal right next to one another.
We would really appreciate any help that anyone can offer, Thanks

You should be able to do that either with the options or some CSS.
Could you give a link to that page so that we can use firebug and give a more precise answer ?

Here is the site, thank you for responding.

www.heymrsedwards.com/dogshop/

You can go in the menu Display->content menus and edit your menu "event tickets". There, you can select the number of columns.

Thank you very much