The variable to control de button is $template_hook[postbit_controls]
me I have it setup that way in my postbit template:
Code:
div style="margin-top: 10px" align="$stylevar[right]">
<!-- controls -->
$template_hook[postbit_controls]
<if condition="$post['editlink']">
<img style="display: none" id="progress_$postid" src="$stylevar[imgdir_misc]/progress.gif" alt="$vbphrase[loading_editor_please_wait]" />
This put it to the left of the edit button instead of to the full right which is not a really visible position