Hi dhdhhl,
Congratulations on your new Landmark and welcome to the Heartland Owners Forum. This is a great place to get answers and socialize with a great bunch of friendly people.
Here's a link to the Safe manual which is located in the manuals section of the forum. According to the manual, the first thing you have to do is locate the key to open the safe. Once open, you install the batteries and set it up for keyless operation. The key should be in the pouch with your manuals, but might be sitting in a drawer or cabinet somewhere. If you didn't get it, give your dealer a call. If they can't find it, you or they will have to order replacements from the safe company.