If you would like to move the Windows Explorer icon (the one that opens your library) to the bottom right of your taskbar: right-click the taskbar and deselect "Lock the taskbar". A dotted line will appear (see image) between the start button and the Windows Explorer icon. Click on that dotted line and drag it to the right side.
If you want to add a shortcut for a different folder you have to make a custom toolbar.
Visit this link
if you are interested in setting one up.