Urgent IngramSpark Cover Formatting

I already have a print-ready PDF for both the front and back cover of my 6 x 9 inch book aimed at 7th-grade girls. What I’m missing is the technical step of dropping that design into the correct IngramSpark template so the spine, bleed, barcode area, and margins line up perfectly... (Budget: $30 - $250 USD, Jobs: Adobe Creative Suite, Adobe InDesign, Book Cover Design, Brochure Design, Graphic Design, Photoshop, Print Design, Publishing)