If you got a meal plan with residence, you probably selected a size, so you should have money in it. If not, you might have been defaulted to have a regular size, but that is just a guess.
To check how much money you have in your meal card account, log in here:
https://mealacct.mcmaster.ca/
For extra help as to how to use that site:
http://mealcard.mcmaster.ca/acctnfo.htm