Icons2go is the most powerful and easy to use icons plugin for WordPress. It allows you to choose among 1000+ custom-tailored and unique icons.
It will be installed on your WordPress installation with the automated installation wizard of the theme.
Once installed, you need to activate at least an icon set. Go on Settings > Icons2go.
Choose an icon set and activate it by clicking on ACTIVATE SET.
You can find more details regarding Icons2go usage on its manual here.