How to change mailing address when living outside Canada

[vutrang]

I (sponsor) am living outside Canada.
CIC in Mississauga sent me a letter about the decision of my sponsorship application(step 1) on 28/02/2014. However, the mailing address I did fill in the form incorrect.

How can I change new mailing address and tell CIC resend the decision letter to me?
Can I ask CIC send me letter via email?

Thanks for any help,