While you searching for any products on Amazon then you can add the items in cart to buy later. Whenever you go to add any items in Cart then you should click on the Add Cart option and then they will ask a few questions like size and colour. So, you should confirm them to add a particular item in your cart. If you are not able to add any products in the cart then contact us or talk to live person at Amazon. https://www.amazon-customerservicephonenumber.com/