[Lynne]

You need to modify your postbit(_legacy) and put a condition in there where you want the image to be.

<if condition="is_member_of($bbuseinfo,5)">
image for admins
<else />
  <if condition="is_member_of($bbuseinfo,6)">
  image for supermods
  <else />
    <if condition="is_member_of($bbuseinfo,7)">
    image for moderators
    </if>
  </if>
</if>