[BigJohnny]

styles & templates > style manager > "Style you want to edit" > postbit or postbit_legacy template, depending on which one you use.... most likely postbit legacy since your asking for this.

for instance you would find:

<if condition="$post['age']">$vbphrase[age]: $post[age]</if>

and change it to:

<if condition="$post['age']"><div class="info">$vbphrase[age]: $post[age]</div></if>

that will surround the age part with one of those boxes.