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.