The address on your promo campaign is automatically pulled through from the address entered for the label on the Label Details page. If you want to remove the address, just delete the address completely then click Apply.
This will instantly update all promos sent from that label.
NOTE - If it is still incorrect after clicking "Apply", try clearing your cache and then re-loading the promo.
To find the label details page, follow these steps:
- Go to Labels > Record Labels
- Select your label and remove the address from under the General Information