[BirdOPrey5]

OK for Next to the Page Nav menu do the following.

In SHOWTHREAD find the line:

<if condition="$show['pagenav']"><td align="$stylevar[right]">$pagenav</td></if>

And Replace with:

<td align="$stylevar[right]">
<table border="0" width="1%" align="right"><tr><td align="right">
<if condition="!in_array($GLOBALS[forumid], array(X, Y, Z))"><a href="http://twitter.com/share" class="twitter-share-button" data-count="horizontal" data-via="YOUR_TWITTER_USERNAME">Tweet</a><script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script><else />&nbsp;</if></td><td align="right"><if condition="$show['pagenav']">$pagenav<else />&nbsp;</if>
</td></tr></table>
</td>

Follow all the other instructions in the top post including changing "X, Y. Z" to forumids of forums you don't want to show the TWEET button in and replacing YOUR_TWITTER_USERNAME with your twitter username.