Should you wish to add various items to your cart
1) Click on the publication name click on "subscribe" or "buy issue"
2) Click on "Continue Shopping"
3) Search for the publication on "Search for Magazines"
Repeat steps 1 and 2
To view your cart at any stage simply click on the cart icon and you have the option to close the cart page via the "X" or "Continue Shopping"
See this article to delete items from your cart