You can not.
Customer support on eBay Canada is by telephone only.
The answers to most questions can be found in the
A to Z Help Index
http://pages.ebay.ca/help/index/A.html
In addition an eBay staff member is available online most Wednesdays from 1pm until 2pm Toronto time to respond to questions and assist members on the
Weekly Board Hour Session
http://community.ebay.ca/t5/Weekly-Board-Hour-Session/bd-p/23000000073
