If you're not a seasoned canner, educate yourself on canning basics since they are not included in this recipe. Leela's pretty sure you've heard of Google.
Potatoes must be pressure canned because of their low acidity.
The National Center for Home Food Preservation (NCHFP) is a source for all types of food preservation.
Disclaimer: some instructions say you must peel potatoes to be safe. I choose not to peel, and it's your choice as to what you feel comfortable doing.
Always follow the instructions for the pressure canner you're using.