Board Thread:Questions and Answers/@comment-27906202-20160303032033/@comment-26091666-20160303041020

You may also need to provide personal details of your account if you want a "smooth" transaction with email change as well. The information that may be handy are as follows: Needless to say is that if you have not provided these information (where applicable) on their site such as for instance your credit card information then you don't need to provide them. They may require these for verification.
 * Registered email address (probably both old and new)
 * Your address
 * Your telephone number
 * Credit card details
 * DMM historical transactions (Former name: DMM Money)
 * etc
 * Your connection environment (such as):
 * Your computer's OS
 * The name of your browser
 * Your ISP
 * etc.

Then again you could also do what Nanamin wrote here and that would also do the trick.