How do I use Print-At-Home designs to quilt from the back on my longarm?

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• How do I get a new start point in a saved design?
• Does the design I like have a Print-At-Home option?
• Do I have to own/use a Pro-Stitcher to use these quilting designs available at prostitcher.com?
• What digital design file formats are available for purchase on prostitcher.com?
• Why are my designs wonky on the screen in simulation?