I've followed every possible sources for this. I wanted to create a configurable product (i.e. iPhone Back Cover [11 Colours]). I also created a new attribute list with all 11 colours and created an absolute right attribute set. The problem is when I go to create a new product based on this custom configurable attribute: Manage Product >> New Product >> Create Product Setting >> Selected Attribute Set: Custom Attrobute Set & Product Type: Configurable Product. Here I don't find "Use Complex Product Type" check button. However, I proceeded to next step and selected "Select Configurable Attributes" and then "Continue". But to my surprise I don't find my created configurable attribute on Product Information Page. I need some help on this. The problem is in the Admin part, I'm yet to check frontend.