The uninstallation process depends on your operating system:

For Mac OSX Run (or double click on) the script in your home folder. It is located at Applications/Yahoo!/BrowserPlus/UninstallBrowserPlus.sh.

Under Windows (XP or Vista), there is an uninstaller located in your "My Documents" folder, under My Documents\Yahoo!\BrowserPlus.

Regardless of the operating system, the uninstaller will remove every trace of BrowserPlus from your system, including previous versions and any settings or preferences that have been set while you've used BrowserPlus™ powered sites.