Hi bwallace763,
Welcome to the Heartland Owners Forum and to the family. We have a great bunch of folks here with lots of information and all willing to share their knowledge when needed.
Not sure, but you probably need to remove the back. Look where the back cover is attached to seat and see if it is in place with Velcro, if so then pull it up and you should see a couple of locks that have the back locked in place.
Be sure and check out our Heartland Owners Club. Join us at a rally when you can and meet lots of the great folks here and make friends for a lifetime.
Enjoy the forum and your new unit.
Jim M