[GameWizard]

Best way would be to create a new custom profile field and enter the thing you want to appear in it, and then modify your postbit template to include this new profile field. Beside this, you could bypass the custom profile field altogether and use custom code in your postbit that will show specific content depending on the user id,

so say your userid is 666, you would have:
<if condition="$bbuserinfo[userid] == 666">Content Winner</if>