You can update the information on file for your organization at any time.
Steps
From your Organization Dashboard, click Org Settings.
Under General > Setup, you'll see the option to change your logo, your name as you’d like it reflected on your campaigns, or update your website. Click Save.
Click on the Address tab to change the address of your organization. Click Save.
Your organization’s name, address, and website appear in the footer of every campaign you create. Your logo is also included on every campaign, though it can be customized on a campaign-level. Changing your information here will update it across all your campaigns, but won't overwrite any custom logos that have been added.