In your forumhome template
FIND
<tbody>
<tr>
<td class="thead" colspan="2">
<a style="float:$stylevar[right]" href="#top" onclick="return toggle_collapse('forumhome_stats')"><img id="collapseimg_forumhome_stats" src="$stylevar[imgdir_button]/collapse_thead$vbcollapse[collapseimg_forumhome_stats].gif" alt="" border="0" /></a>
<phrase 1="$vboptions[bbtitle]">$vbphrase[x_statistics]</phrase>
</td>
</tr>
</tbody>
<tbody id="collapseobj_forumhome_stats" style="$vbcollapse[collapseobj_forumhome_stats]">
<tr>
<td class="alt2"><img src="$stylevar[imgdir_misc]/stats.gif" alt="<phrase 1="$vboptions[bbtitle]">$vbphrase[x_statistics]</phrase>" border="0" /></td>
<td class="alt1" width="100%">
<div class="smallfont">
<div>
$vbphrase[threads]: $totalthreads,
$vbphrase[posts]: $totalposts,
$vbphrase[members]: $numbermembers<if condition="$show['activemembers']">,
<span title="<phrase 1="$vboptions[activememberdays]">$vbphrase[within_the_last_x_days]</phrase>">$vbphrase[active_members]: $activemembers</span>
</if>
</div>
<div><phrase 1="member.php?$session[sessionurl]u=$newuserid" 2="$newusername">$vbphrase[welcome_to_our_newest_member_x]</phrase></div>
</div>
</td>
</tr>
</tbody>DELETE IT
This removes the whole statistic box on the forumhome.