Yes we can pick up address on Flipkart but before the shipping of the order through Flipkart app or Flipkart website. To change your pickup address follow these steps-
· Open Flipkart app or website
· Go to my orders.
· Click on the order on which you want to change address
· Here you can see change address option.
· Click it and add a new address.
· There is also a 24*7 customer service of Flipkart which can solve your query whenever you want.
Yes, you can change the address and billing information for default & ordered products. Both the E-commerce websites give you this facility. If you signed in, then it will be further clicks away from the Home page. Take a look at my Amazon account' screenshot.