On Mobile Screen, Please cleck the Categories Round Button To Expand to Select Appropriate Category
Customers can choose the appropritate Category from the drop down menu to browse products

Click Add to Cart Just Below the Product Thumbnail Picture

You Click the product thumbnail picture and go inside to see product full description, view the full size picture and can add to cart inside too.

Once you finish buying all products, click the shopping cart link in the top right side of any page