Winterboard Not Working

I just installed Winterboard on my Ipod and it wont allow me to install themes i put themes on winterboard and they wont show on my ipod when i tick them. I reboot the ipod and it shows the default screen without any of the changes i made being displayed on the ipod. Is there a step i missed in adding the theme by the way i dont have wifi and use Ifunbox to add themes to winterboard.