Select the subscription you would want and click on 'Select Options'. Please note that you can buy any number of subscriptions of any type in a Order, but you can give only one shipping/delivery address for all of them. If you want to buy subscriptions attached to multiple shipping addresses then please make a separate Order for each shipping address.
After you have selected the period of subscriptions you want, click Add to Cart.
Click View Cart and Proceed to checkout
Enter your Billing and Shipping address. Mention your subscription number in the Order Notes and Click Place order.
You will be shown a Payment gateway page where you select the payment mode and click Submit.
Once the payment is processed, you will be returned back to iStore and you will get a Order confirmation email.