Put the Canny Collar on and go for a walk immediately. Keep your leash short but loose when walking and aim to have your dog in the 'heel' position. Using a short dog training leash will make this easier. Give him plenty of vocal praise when he begins walking well.
The first time you put the slip line over your dog's nose, he may resist it and try to paw it off his face. Any dog training collar will cause this reaction for some dogs. It is similar to the feeling we have when wearing a wristwatch for the first time - some dogs are simply not used to it. You should continue walking so that your dog focuses on the walk rather than on the Canny Collar, lifting your leash when he paws at it and verbally encouraging him to follow you.
When you first start walking with the Canny Collar and getting your dog used to wearing it, you will have to pay attention to him during the first few minutes to make sure he is keeping his head upright, that the Canny Collar is loose around the mouth area and that the leash is long enough to be loose but short enough so that the slip line does not move towards the front of his nose and fall off. But these first couple of minutes are an opportunity to connect with your dog and be focused on training him to walk well. The first five or ten minutes are the most important part of the walk for both of you and if you can get your dog walking well in this time, the rest of the walk will be a breeze.
Once your dog is walking, instantly lower the leash to release the pressure on the Canny Collar (you should also let him have some more leash here) and give him plenty of vocal praise whilst keeping walking. He needs to know that at some point in the walk, the pressure will be released; otherwise he may just continue to pull against it.
Repeat this action if again he tries to remove the Canny Collar. Because the leash is connected behind his head, he will not be able to get a paw over the leash and bring the walk to a stop. Nor will he get the Canny Collar off his head if the leash is kept in the correct position. Sometimes you may need to let the leash out if he drops behind you, bringing it back in again once he catches up.
Once any initial resistance to the Canny Collar has stopped, continue walking your dog for a short distance and then stop and give him plenty of praise.
Use treats or clicker training if your dog responds well to these to accustom him to the Canny Collar.