To make mailing creation a bit faster you can configure default values for the From name, From address, and Reply-To address. These values will be used whenever you create any new mailing. Don't worry, you can change them within the individual mailing if you occasionally mail using different address information.
To set campaign defaults, click the Account tab, then select Campaign Email Settings from the sub-navigation. Enter the From name, From email, and Reply-To email in the provided fields and click Save.