Hi olga778.. new to ebay and must understand that buyer's cannot change seller's terms. Any request must be made by using ask a question in the listing prior to bidding/buying.
I see a catalog from seller that does not ship to Canada. Never bid unless seller has been asked and agreed to ship to a canadian address.
Even with a US address , seller can refuse as PayPal requires shipping to your registered address or seller voids their PP Seller Protection.
Use contact in the listing and ask seller if they would consider a mutual cancellation , otherwise its pay.