If you decide to delete a button from your toolbar, you can do so by opening the toolbar customize box (see step 1 in either of the sections above) and then right-click on the button on your toolbar that you wish to remove. Select Delete.
You can hide your toolbar by clicking the View menu, hovering down to Toolbars and then to your toolbar. Click once on the toolbar you wish to hide. You can make it reappear by clicking on it again.
If you wish to delete the toolbar, open the toolbar customize box (see step 1 in either of the sections above) and click the Toolbars tab at the top of the box. Highlight your toolbar by clicking once and then click the Delete button.