From your My Brandcast dashboard, click on your avatar in the upper right, and select Account Settings from the drop down menu.
That will open up this screen:
At the top you'll see the avatar image for this account. You can upload an image (or select one from the Media Library) that will represent this account: a logo for your team, for example, or a portrait for yourself.
Similarly, you can rename the account name, which will change the way it's labeled throughout the app.
The account type indicates which edition of Brandcast this account is subscribed to. If you are looking at the Account Settings for your team, this will always be "Team Account". For your own personal account, this may be "Trial", "Free", or "Pro".
Finally, your role on the account will either be "administrator" or "account collaborator" (if you are a regular user), or "owner" (if you are in charge of your team's account.)
Once you've made any changes, make sure to click the blue Save Changes button.