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1.) Sign in to PhoenixCONNECT
2.) Find your organization's via the 'Organization Directory' or the Action Center
To access the Action Center, select the switchboard in the upper right corner of the home page and select 'Manage.' 
3.) Expand the drawer on the left side of the screen and select 'Gallery'
4.) Select a photo album and choose 'Add Photos'
5.) The photo album should be set to be visible to 'The Public'
Please note that in order to update an organization's cover photo, you must be the Primary Contact and/or have officer rights.