It`s a difference board type then the phpbb board then you use we had the same problem @gp when we tried to change things.
Make sure your board supports it, or migrate it all to a different board type, fook knows how that works but we had lucky enough 2 wizzards withing gp
Good luck creating it, it looks awsome good, size is big enough and the details are not too much so you get a straight view to it, feck hard to explain in english
, it looks good
You can also easily edit the colors to the forum colors where it has to be placed on.