Go to iStore Home Page; https://istore.chennaimath.org/

Click on a category of your interest and browse the products

Click Add to Cart

Your products will be added to cart

The total number of items added to the cart and the total amount will be shown on the top right.

Click on Cart (Top Right of Page) after you have added all your products

Click Proceed to Checkout

Enter your billing and shipping address

Click Proceed to Payment

You will be shown the Payment options, select the payment and click Submit

Once the payment is processed, you will be returned back to iStore and will get an order confirmation email.