You can change your company name in the footer that we insert in your messages by editing your address details. This is done by clicking on your account ID in the top right corner of the page and selecting My Profile. You can edit the company name in the Account Profile tab. Click Save to complete the change.
Why is your company name added to the footer? In order to send bulk email marketing campaigns, you need to include your company name and physical address at the bottom of email campaigns. This is one of the requirements of the CAN-SPAM act.