Welcome to the community!
If you have the 1000 International minutes (selected countries, see here), it should be listed in your Plan details in your My Account under Services --> Mobile --> My Plan. If you are unable to access your My Account, you can contact Fido customer service or send a moderator a PM. They'll be able to provide your plan details.
If you don't have the included international minutes, a call to Mexico would be charged as follows:
Taken from here.
You can view the Value packs here.
Hope this helps