You can change your mail address by log in at any of Pioneer DJ web sites below.
Below steps are on https://www.pioneerdj.com/en/account/login/
1. Log in with your mail address and its password
2. Edit your mail address on your "My Page"
You can edit your mail address on "My profile"
Your current registered mail address shows up.
Fill in with your new mail address
Click "Save changes" to store your new mail address.
A verification mail will be sent to new mail address you have just set, Until you verified, new mail address
is not validated.