In the CSS Styles Palette highlight li and at the bottom choose the "Set only properties button"
and then click Add Properties. Add the following properties for the selector li in the CSS Styles palette on the left...

Now the list is in an horizontal line. If you want vertical menus delete display: inline;...
Next we will add new Psuedo Element selectors in this order:
a:link, a:visited, a:hover, a:active to further style the links
In the New CCS Rule box Choose "Compound" and add a:link, a:visited, a:hover, and a:active separately... just like when we added "li"