By default, after you install the AVADA Email Marketing app, the Sender Email and Sender Name will be set as [email protected] and Customer Success respectively.
You can add a custom Email Sender and set the Name by your wish.
See the full guide to Add a Custom Email Sender here.
You can set your custom email sender as the default sender.
The settings will not be applied for Email Campaigns you have created before. For these emails, you have to change the email sender in the Email Editor.