ShineOn: Print On Demand

Having trouble converting ShineOn Fast to my store so my potential customers can customize products. I've been trying pretty much all day. still is not syncing with my shopify store. I accidentally promoted these products, and no one could customize. I thought that the customer would automatically be able to do after adding products to my store, but this has been an issue. I bought customily but the name necklaces aren't on Customily.