Limeroad — blue denim dress

Address: 781005

I ordered medium size of blue denim dress according to my body size but it's coming too small on me!
I would like to exchange it for a large size product. I want size large! I am also little concerned about how it will be conducted by limeroad. Will it be hand to hand exchange of the product or do i have to return and wait for the exchange? I want limeroad to ensure a hassle free authentic and valid exchange of the product!