I assume you are referring to the toolbar in your browser that lets you add your most oft visited websites to it. Which browser are you using?
I will assume for the time being that you are using Internet Explorer that comes with Windows 7. In Internet Explorer, the toolbar I believe you are referring to is called the Favorites Bar. Provided you have the Favorites toolbar already displayed at the top of the browser window, it is very easy to add sites to it. While viewing a website that you wish to add to the Favorites toolbar, left-click and hold on the little icon for the site in the address field, then drag it down to the Favorites toolbar and release. The website should be then be added to the toolbar and you should be able to click on it to go directly to that website in the future.