I am loosing tons of sales because when customers go to the cart a pop up message appears telling them they cannot proceed as there is no payment method. I have Amazon pay from Simtech but can't get any help from them on the cause of the pop up. If a customer click on the Add to cart button they get this message, but if they click on the Amazon button they just need to sign up and follow instructions to fill out address ect.. How can the add to cart button be removed?

My guess is, Amazon is a quick checkout method, and you don't have a "normal" checkout configure. Can you try adding something like bank transfer to see if that at least removes the message?