How to become a Canadian citizen? Attach the name and address of the sender.

The United Kingdom of Great Britain and Northern Ireland is Britain, so going to Northern Ireland is going to Britain, not Canada; So you can't become a Canadian citizen. It is recommended to join British citizenship and go to Canada without a visa.

British citizenship:

You must have lived in the UK for more than 5 years and have permanent residence status 1 year (you can't leave the UK for more than 3 months in the last year) before you can apply. If you marry an Englishman, you only need to live in Britain for three years and have permanent status when you apply.

The applicant needs two referees to sign the application form. The recommender must have known and understood the applicant for more than 3 years, including: letters of recommendation from professionals, including doctors, lawyers and teachers, and letters of recommendation from non-professionals, excluding relatives. The application fee is 655 fatso, 18 is 470 fatso. Applicants must also take the British Life Test.

These are what I read in the student handbook. They should be correct.