Try this
1)In your Admincp,under Style Manager,Main CSS options,add inside the Additional CSS box
PHP:
.postdata {
border-top: solid 1px #E0E0E0;
border-left: solid 1px #E0E0E0;
border-right: solid 1px #D7D7D7;
border-bottom: solid 1px #D7D7D7;
margin: 3px 5px;
padding: 2px;
color: #808080;
background: #FFFFFF;
font-size: 10px;
}
and click Save
NOTE:You should change the color of the background of the box or size accordingly to the style you are using.
2)In your AdminCP,Style Manager,Edit Templates options,go to edit the Postbit_Legacy option,under this code,
PHP:
<if condition="$post['joindate']"><div>$vbphrase[join_date]: $post[joindate]</div></if>
<if condition="$post['field2']"><div>$vbphrase[location_perm]: $post[field2]</div></if>
<if condition="$post['age']"><div>$vbphrase[age]: $post[age]</div></if>
<div>
$vbphrase[posts]: $post[posts]
</div>
<if condition="$show['infraction']"><div>$vbphrase[infractions]: $post[warnings]/$post[infractions] ($post[ipoints])</div></if>
Edit the relavent <div> tags that you wish to become enclosed in the box to become <div class="postdata">.Meaning,you should get something like this
PHP:
<if condition="$post['joindate']"><div class="postdata">$vbphrase[join_date]: $post[joindate]</div></if>
<if condition="$post['field2']"><div class="postdata">$vbphrase[location_perm]: $post[field2]</div></if>
<if condition="$post['age']"> <div class="postdata">$vbphrase[age]: $post[age]</div></if>
<div class="postdata">
$vbphrase[posts]: $post[posts]
</div>
<if condition="$show['infraction']"><div class="postdata">$vbphrase[infractions]: $post[warnings]/$post[infractions] ($post[ipoints])</div></if>