I tried bu this is what I got:
The username you have selected (......) already exists in our Reseller Database.
If you have registered with us before, you may simply login directly into your Reseller Control Panel. Click here to access the Reseller Control Panel.
Alternatively you may use any another email address to signup with us below. Note that you may change this email address at anytime from within your Reseller Control Panel.'
so I login into the reseller control panel, it works, but I still didn't get any welcome email from them.
So, what's next, what I should do to integrate this account with WHMCS?
THANKS.