Would like to add some drop down info under the avatar
 

There is another forum that i'm on and they have something where people can fill out fields for info on their jeep and it will make a drop down menu. here is an example on a random thread.
http://www.jeepforum.com/forum/f9/old-man-emu-855595/
Basically i'd like to do the same thing that you see right below the username that has the vehicle modifications when you click on the arrow. I run my forums for tuning cars so i would like to do the same thing, but with different fields. If anyone can point me in the right direction i would really appreciate it!!:D