I had the same problem, so what I did was look at the first picture from walmart.com's page with this car seat.
http://www.walmart.com/catalog/product.do?product_id=10843110
I noticed where the straps went through the restraint systems, and remebered that I took the bottom ones out last, so I'd put them in first.
Then I threaded the straps through the buckle parts that snap to the bottom buckle, up through the buckle parts that snap together, then back through the holes in the cover and seat at whatever height your infant is. After that you secure it in the back like the sticker at the side indicates :)
I hope that's clear enough!
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