Moving this to the Game Help board so that other people will know you're having an issue. The Request/Find Meshes section is great for looking for something in particular, but if you're having an issue with something or don't understand a concept, the Help threads are the best place to go. c:
There's a little arrow with a number next to it above the material text box.
(http://orig02.deviantart.net/d383/f/2015/354/f/0/screenshot_12202015_172111145_by_chrome_domey-d9ktfcl.png)