Click and drag the URL onto your bookmark bar.
You'll notice that at the far left of every URL there is an icon. It might be a green lock or look like a white piece of paper.
Click (and hold) this icon and drag it onto your bookmark bar. When you see a black line on the bookmark bar, let go of the mouse. The bookmark should appear on your bar in that spot.
Get rid of those pesky words!
Many popular sites will have a favicon, or image, for their website. This will allow you to take away the words and still know what the bookmark represents based solely on the icon. This allows you to add MANY more bookmarks to the bookmark bar!
Examples of favicons on a bookmark bar:
To delete the words of a bookmark, right click on the icon and select Edit....
Delete the text in the Name: field. DO NOT delete the URL. Then, click Save.