[Help] vBulletin 3.8.6 HTML

[Absolute-Hosting]

Okay i have vBulletin 3.8.6 and i was wondering how can i put some html on every page that the user goes to as long as they are logged in.... i was it sorta like this well exactly like this actually

inglorious-rpg.com
(i am in no way advertising there site i just need help and there is a perfect example right here but you do have to register to see it you can delete your account afterwards if you like

any help would be greatly appreciated i really need help with this

[Greg]

<if condition="$bbuserinfo['userid']">

</if>

[Ashli]

This is what I was looking for, Thanks a lot!