Adding to John's advice, make sure you change the default model number over to a name. If you only have one model the default will be MDL1 and you need to go into the setup list to change the name over to "RIOT". Then go into the main menu and select a new model which would be MDL2. Once selected you can go to the setup list and give this a real name too. Now you can bind the second model like you have done before.
A little tip...if you are making any adjustments it makes sense to copy your model information to a new memory location and give it a new name, eg. "RIOT2". Then if (and when!) you mess it up you have the original information stored as a backup.
Mike