Actually, it is self-register - at least for the first part. Link to DWAN site is http://cda.mil.ca/cfmlc-cdmfc/poct-eng.asp. Not avail on Internet. You have to register to complete the Threshold Knowledge Test, which is based on the Course Manual (available for download on that page). Once you've completed the TKT, you send an email to the address indicated requesting to register on a specific course. Link to a schedule of upcoming courses is also on that page.
Go to the link and read through it - it explains all the above and more.