UI isnt user friendly

Doodle Collection

When i tried ordering it 1st time,it denied to accept the discount voucher I bought frm mydala.It said its an invalid coupon.
I got this fixed by calling the mydala customer care.Post that I am unable to login only on thier page to order.
Had to order this planner to gift somebdy on bday but couldnt order due to their nad user experience on their website.Pissed off!