Yes, if you have bought a dog you add your kennel name to the end of it's name.
The only way you could add it to the beginning, is if you bred both parents then sold them on and somebody bred from them and you got a puppy from the litter.
Just to add, you can only add your kennel name if the dog has not gained its stud book number -after that the name cannot be changed. You have something like 30 days I think after qualifying for the number, then it's too late.
Obviously the KC can be a bit slack sometimes! ;-) The reason I have the form dated is that the bitch missed, so I never sent off the registration application which had been signed and dated by the stud dog owner, and never got around to throwing it out either.