Answer 6 of the FAQ on my signature tell you exactly that. Let them know first via e-mail.Mukam said:Tyrus I need to mail cic a new letter (sealed) from graduate studies. The previous one that I sent did not have the stamp. So I got a new one and I was thinking that I should send it to them before they send me my application back.
Meanwhile I have also renewed my passport, so I am going to email a copy of my new passport as well. I have the email address but not their physical mailing address. If you or anyone else can help, it will be highly appreciated.