Upon signup, if you've selected that you are a Canadian citizen, you will have a section open in your settings called "Canadian Tax Forms"
Inputting your Federal Registration Number will make tax reporting much easier for you when tax season rolls around. If you currently do not have a Federal Registration Number, you may just tick off <No> from the selection box, and you may add it at a later stage!
If you have any questions, simply send an email to help@manyvids.com