Only offers Canada & USA

I am not sure if this is the theme or the ecommerce plugin but when someone goes to buy one of the ebooks I have up at

http://www.howtobooklets.net

They can only choose Canada and USA as their possible countries and yet I have the pricing in pounds sterling!!!

It also means that a person has to enter a two letter state abbreviation which we don't have in England. How can I change that to include the UK or to at least go blank so people can add whichever country/postcode they need to? I don't actually need an address so if I can remove the need for the address and just have them sign up using a name/email address and then paying with paypal that will work for me too.

thanks