Chest and hold the back legs together to easily get them down in the kennel, if they have razor claws and wiggle to much you could very carefully scuff them if you have to for the few seconds it take to get them in, again only if necessary!

Give them at least a 3-5 minute break to try getting them to calm down a little, stand the kennel up long ways so the door is open and facing up, putting it against a wall or in a corner doesn't hurt so it doesn't fall.
If you can very gently move to hold the top half of their body against your-