How do I?

In postbit_legacy template find:

HTML:
<tr valign="top">
	<td class="alt2" width="175" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px">

Replace with:
HTML:
<tr valign="top">
	<td class="alt2" width="175" style="border: $stylevar[cellspacing]px solid $stylevar[tborder_bgcolor]; border-top: 0px; border-bottom: 0px" align="center">
 
Im using 3.7.3 and i can only find.

<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center" >

and

<tr valign="top">
<td class="alt2" width="175">
 
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