First off if your dog is having a seizure you should never move the dog unless the dog is in danger of getting hurt from falling etc.
If you do need to move the dog that is having the seizure gently move the dog using it's hind legs.
Be sure to keep any noise to a minimum and make the room or location the dog is in as peaceful as you can make it by getting anyone else out of the room that doesn't need to be there and stay calm yourself.
Usually just giving it a few minutes the seizures in the dog will be over and they're usually not life threatening but if the seizures last longer than a couple minutes or occur more frequently then you may need to get your dog to the vet.
There's not really too much else you can do for your dog having a seizure but just waiting it out and keeping the room quiet and staying calm.