I would direct you to the
French Steelbook editions thread (this is the Amazon Germany thread), and to
my step-by-step guide on how to order the Fnac-exclusive Aquaman steelbook.
As I say in that post, I would avoid using Chrome to translate the website into English. And if possible, enter your card details for Fnac rather than use Paypal.
One thing you can try, though, is putting "Ottawa, ON" in the Ville (City) field, rather than just Ottawa. PayPal may recognise that. Someone else had this issue with their Paypal billing address in the French Steelbook thread, and ended up using a credit card (successfully) instead.
If you really find it impossible to order their Aquaman steel, I can order you a copy using my account and card, and entering your address (as I was previously able to do for someone with a US address, who Paypal-ed me).