It's not that simple.
If you want to become a Canadian citizen, you first have to become a Canadian permanent resident.
To become a Canadian permanent resident, you have to apply to immigrate to Canada and be accepted/approved.
If you are interested in immigrating through the federal program, start reading here:http://www.cic.gc.ca/english/immigrate/business/index.asp
If you are interested in immigrating through the provincial programs, the information is here:http://www.cic.gc.ca/english/immigrate/provincial/apply-who.asp