To cancel any order on Mufti, you need to go to your "My Account" section. From there, you need to select the order which you wish to cancel. Also, if you wish, you can cancel your order partially. But if your products have already been shipped, you will no longer be able to cancel your orders.
And for all the cancelled orders, the refund will be initiated within 48 hours of cancellation. The refund amount will be processed within seven working days through the same gateway you've made your payment.