Binding confusion ??

I am not quite ready to do the binding yet,but as I was having a look around I am a bit confused with what has come with my Kit.

I have the side binding - no worries,but then I have 3 (2 White and 1 Black) very fine bindings.

I am not sure how these are suppose to go on the top.Stewmac keep mentioning white/black.

How do you glue the 3 fine strips in??