Go and apply for a US entry visa at a U.S. Consulate.
Depending on your status and current passport, you need to choose the correct application form. Don't expect it to be done within days tho. http://www.amcits.com/vancouver.asp
or you can ask travel agency to help. The one helped my wife before told me that as long as you are still studying (not graduating) and have enough money in the bank, it should not be hard to get the US visa.
same procedure as landed immigrants(who does not have us visa)...
check online: Make appointment, prepare documents(i remembered one form must be filled online and sent through net after filling up|)...prepare all documents need for interview date