A C-collar is a CID (Cervical Immobilization Device). Best bet...if you do NOT know how to use it....don't.
The collar is applied and the patient is placed onto the LSB (long spine board) and HID's (head immobilization device) are placed. The patient is then strapped (there are many configurations of strapping) to the LSB. It is time consuming and involved.
That makes sense - don't worry, I'm not tempted to try anything I'm not trained and qualified for. I was confusing the HID with Martin's CID. Thanks for the explanation!