1. Please add / edit the products(Catalog -> Products) which you want to sell in the campaign only to “Campaign-2018” category(Catalog -> Categories). Then only it will be visible in the cart.
2. Open the guest location class list page.
3. Click on the Campaign link.

4. Select the products which you want to add to the cart by selecting the quantity of the product and then finally click Add to Cart button to add the items to the Cart.

Note : Please add the products which you want to sell in the campaign only to “Campaign-Aug-2018” category. Then only it will be visible in the cart.