When a new CSS style is chosen, a pop-up box will appear titled “New CSS Rule”. In this box, you will first be presented with a choice

click to enlarge
of a ‘Selector Type’. This choices include Class (can apply to any tag), Tag (redefines the look of a specific tag), or Advanced (IDs, pseudo-class selectors). To create a
hover text effect, chose the “Advanced” selector type. Next, open the drop down menu to the right of the “Selector” option and chose “a:hover”. Lastly, you will have a choice for the “Define in” option. For this area, select the choice that says “This document only”. Finish my clicking “OK”.