Type means, what kind of image you want, like you said you wanted a sig. Image, is what you want like for example: Link, I'll find me a picture of Link to use. Background, is the thing you want to blend in with your render/image. Text, is what you want me to type in to go with the sig. Font, is something that you want me to use: look at the ZeldaDungeon logo that's a font. And other, is for something you want for extra.