Myntra.com — return process

I want to the return the product but i am enable to do it. Whats the problem & how do i change my email id of i want to. The return process is failing again & again.
Pls reply asap. Nor do i hve sellers email id or phone number to which i can contact them. I tried many times to make a return request but it was failing. The product which i receive is defective. Pls let me know