Hi,
I have registered a domain «.com» with whc.ca. I want to transfert this domain to dynu.com but I have a question.

What's the pricing for transfert my domain to you ?
You tell that I you add 1 year subscription, Do I have to paid for that ?

Domain transfer for .com domain names is $10.99. An additional year of registration is added to your domain upon completion of the domain transfer without any additional cost. For example, if your domain expires on September 1, 2015, after the transfer is completed, your new expiration date would be September 1, 2016.

You may place a transfer order at https://www.dynu.com/ControlPanel/TransferDomainName