I did not want to do that but I have no choice.
The problem is that DH will record your email address when you come to the payment page although you did not make payment. I did not pay using credit card because I felt that the payment page did not look secure. So I just close the page.
When I came back to the page second time. The system complained the email address is already in the system. I did not even realize that I already have a webid. AND even I tried to add a plan in DH panel, I ended up with the same problem, email address is already in the system because it will direct me to the same sign up page.
I had a lot of headache with my sign up. I had no choice but to use different email address at that moment.
Finally I'm now in DH. phew
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