Send an email to info @ wikitree.com (remove spaces) with the information stated above along with the email you used and the email address you would like it set.
If your able to login you may be able to change your email address.
To change your e-mail address click to the edit page of profile, change the E-Mail Address field, and save your changes. You will need to click the save button twice because the first time a pop-up will ask you to confirm the change. Note that your e-mail address is your WikiTree login