Hello @user7587638 ,
You can update your account's main email address on the My Account page. If your username is the same as that address, you can update it through the My Account page as well. You can update the account's billing address under the billing subtab of My Account.
Keep in mind only addresses you've verified are available for use as the main account email, sending address, or billing address.
Since you don't have self-authentication setup, you can just set up your emails to send from the new address. That said, I would recommend getting your account setup for self-authentication as soon as you can, to maximize your delivery rates and the stamp-of-approval for having us send your emails for you.
If you're going to be sending emails with multiple different from addresses, or you'd just like some additional insight and guidance on the matter, I'd recommend speaking with our Delivery team. That way you'll know for sure what you need to do on your end, outside of your Constant Contact account, to get everything setup within it properly.
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