The text file says to add the bump code to the showthread template. You must mean showthread_adminoptions. I'm using vB 2.2.9. The code that works in that template for that is;
under
Code:
<option value="stick">Stick / Unstick Thread</option>
add
Code:
<option value="bump"><a href="postings.php?s=$session[sessionhash]&action=bump&threadid=$threadid">Bump</a></option>