https://www.canada.ca/en/immigration-refugees-citizenship/services/application/account/link-paper-online.html
and
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=2ahUKEwjPuMq42aToAhVbOs0KHcXtCPAQFjADegQIAxAB&url=https://www.canadavisa.com/canada-immigration-discussion-board/threads/how-to-link-an-application-to-cic-account-step-by-step-instruction.619724/&usg=AOvVaw0ZCKh0uIIBBcGZOPq5FU_W
and
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=2ahUKEwjPuMq42aToAhVbOs0KHcXtCPAQFjADegQIAxAB&url=https://www.canadavisa.com/canada-immigration-discussion-board/threads/how-to-link-an-application-to-cic-account-step-by-step-instruction.619724/&usg=AOvVaw0ZCKh0uIIBBcGZOPq5FU_W