The email address that is displayed when you add a link to a party is the email you used to sign in to InLinkz.

If you want to change it, you need to log out of your currently logged in account and sign in to your other email. You can find a logout button just right beside the "add link" button

After this, when you click on "add link" you will be requested to add your email again. Use your alternative email here

PLEASE NOTE

If you are logging in with Google, it automatically fills the same email you are logged in GMail with. To change that, you need to logout from GMail and login back to GMail with your desired email