Halo 3 Appearance Help please!?

[runeplasma47277]

I've just started playing Halo 3 on Xbox Live. I want to know how I can change my appearance. I have the rank Apprentice Grade 2.

 

[The Man with a Camera]

If you have more armor, click the pause button. Take the left stick and flick it to the right. Then, scroll down until you reach appearance. Then just select the category, and change.