Each Organization has the option to add their own logo, specific for their site. Only site Administrators can update the Organization's logo.
From the Administrators Home page, click the gear icon located on the upper right corner of the current logo. This will appear when you hover over the corner of the current logo.
Next, you will select Choose File to locate the logo that you would like to use, select the file and click Submit. You can also choose to have text that will get placed over your logo. To do this, you will want to click on the, Edit Short Name link.
Note: The image file must be in .jpg, .gif, .png and under 1MB prior to upload.