Before you get it on your bottom right corner, drag i to your desktop so then, when its no there you can just click it for your desktop, thats wat i do 

  :confused:Evrey time i hit "Create New World" Its an error, Is tre a soution to that?

Ok, i just thougt if i did this first, the easy things would be much more easy

All the link above does is give you the common.lvl tool. 

Can somone tell me were to find "Custom" I don't know where to find that.