Tab mini c home screen wallpaper?

This may sound stupid to experienced boox user's but I've tried looking everywhere for an answer and I really can't find one. I recently got the Boox tab mini c and it was nice setting it all up but then the option for the home screen wallpaper doesn't let you actually select one? It just shows you the current home screen? I'm very confused and was wondering if setting a wallpaper is actually possible or I have to settle for just the plain white background?