Signs and Level Fonts/Colors

Ok, so I have another questions. I played a few different levels, and noticed some things. When entering a level, some people change the font and color of the level name. They also do that on signs... How do I do that? Is it the same kind of options such doing this? Or is it a mod only thing? And also, in the forum, how do you make the code boxes, but not for code? Such as instead of it saying "code" it says "challenges" or something like that.