[Dr.CustUmz]

I cant relly play around with the plugins right now, but an idea of what you'll want to replace username with change both instances of USERNAME to the username variable, and give this a try in postbit template.

<if condition="$post['usergroupid'] == 10">
  <if condition="$userinfo['field7']">
    <span style="color: #$userinfo['field7']">
      USERNAME
  </if>
<else />
Username
</if>