Edit the template, memberlist. Find this code:
<vb:if condition="$show['reputationcol']">
<td class="reputation">
<span class="member_reputation" title="{vb:raw userinfo.username} {vb:raw userinfo.level}">
<vb:each from="userinfo.reputationdisplay" value="row">
<img class="{vb:raw row.class}" src="{vb:stylevar imgdir_reputation}/reputation_{vb:raw row.posneg}{vb:raw row.imgext}" alt="" />{vb:raw row.rowend}
</vb:each>
</span>
</td>
</vb:if>And change it to this:
<vb:if condition="$show['reputationcol']">
<td class="reputation">
<vb:comment><span class="member_reputation" title="{vb:raw userinfo.username} {vb:raw userinfo.level}">
<vb:each from="userinfo.reputationdisplay" value="row">
<img class="{vb:raw row.class}" src="{vb:stylevar imgdir_reputation}/reputation_{vb:raw row.posneg}{vb:raw row.imgext}" alt="" />{vb:raw row.rowend}
</vb:each>
</span></vb:comment>
Level: {vb:raw userinfo.reputation}
</td>
</vb:if>The part in red, is what will show the number.