You can update your store's email addresses yourself in the Nomni Ordering (OrderUp) console. You need a console user with access to Location Settings.
Steps
Log in to the console and click Location Settings > Location Setup in the left menu.
If you have more than one location, click Edit this Location for the store you want to change.
Update the email field you need:
Email Address: your store's contact email.
Reporting Email: where reports are sent. You can also add a Reporting CC Email and Reporting BCC Email.
Emails (failed order reporting): who is told when an order fails to send to a third party.
Scroll to the bottom and click Save & Continue.
What you should see
The new address shows in the field when you reopen Location Setup.
Good to know
This changes your store's contact and reporting emails, not the email you log in with. To change a user's login, see your users list, or ask your account admin.
If your store is connected to Lightspeed (Kounta), re-importing the store from the integration overwrites these details.
See also: How to Update Store Details (address, phone and ABN).