You can change your email address on the Email Settings Page under "Personal Email".
Make sure that you have selected your personal account and not your company account. Otherwise, you will end up changing your email settings for your personal account.
If you want to switch accounts between your personal and company account, please refer to Switch between Company Account & User Account.
If you are still having trouble, contact Wantedly Customer Relations Team from here!
Sorry for the inconvenience :(