Shareaholic provides 2 code snippets.

The first is a Javascript that is to be placed prior to the </head> tag.

UBB has a Shareaholic code section that indicates that code will be placed prior to the </head> tag.

The second bit of code is html as displays the buttons (<div class='shareaholic-canvas' data-app='share_buttons' data-app-id=''></div>) and is to be placed where you want the buttons to appear.

The only place in the UBB configuration I can find for palcement is the FOOTER code section.

By adding the JS in the HEAD section of the HTML Includes, the buttons are displayed in in the FOOTER.

I have 2 installs of UBB. One (outdoorwire.com), the buttons display in the FOOTER.

On the other (4x4wire.com/forums), the buttons appear in the footer and, because I experimented with the placement options on the Shareaholic admin panel, they also appear on the left side of the screen. That works as the buttons are always visible and appear to not provide a display issue on mobile devices. With my look and feel, I may add some padding to the left so the buttons do not overlap text.