Open hisports.app in your browser and select Office Management.
Log in using your Username and Password.
Navigate to the desired Team or Office using the left navigation menu and the filters.
Select the Edit button found in the top right.
Either Drag & Drop an image unto the logo field or hit the field and select the image file found on your drive.
The logo should appear—hit Save.
To delete a logo, hover over the logo with your mouse and hit the Delete icon.