Send your application to:
Case Processing Centre
Vegreville AB
T9C 1W1
Note that you should use a 23 cm x 30.5 cm (9” x 12”) envelope to mail your forms.
For more info, please see the guide
”Applying to Change Conditions or Extend Your Stay in Canada”
http://www.cic.gc.ca/english/pdf/kits/guides/5217E.PDFGood luck!