Here's the website:
https://mealcard.mcmaster.ca/
Here's their contact info:
Email:
[email protected]
Phone: 905-525-9140 extension 27448
Fax: 905-522-5395
Or, if you're close and just want to go in to speak with them, you can go to Commons 128 and change it there! =)
You can always add to it throughout the year as well! Which is why I'd recommend getting a smaller one and adding to it as it's hard to tell how much you'll spend.