The eBay emails and the seller email through eBay should all have links to click on to make payment.
Your eBay Purchase history should show the item and have a link to pay.
www.ebay.ca/myb/PurchaseHistory
...
Are you set up with a PayPal account?
If not you need to set one up or contact the seller and ask if another way to pay is acceptable.
Are you buying on eBay.ca or eBay.com?
Does the seller ship to Canada?
