Stack v2.1

I've tried a lot of different things, i cant simply add icons to my stack. I touch and hold till icons float then drag it and hover over the stack but it wont add? Any ideas? I've uninstalled it a lot of times and re installed it, reboot the phone, removed the 5 icon dock app from cydia and left the original four. I've also changed the position of the stack from center to right and back again. I'll really like to use this app, but man! Any help would be greatly appreciated.

 

Thanks, i just got it. I've never installed any application besides themes using cyber duck, any ideas on how to do it. Thanks