From the images you shared, you are connecting to the calibre Content server, a web based interface that is part of calibre. The error message you posted the image of is the one you see when an anonymous user attempts to perform a write operation, as the error say, "Anonymous users are not allowed to make changes". To get around that, you need to set up users for the calibre Content server. You can do that from the GUI which is what I described or you can do it from the command line, see
Managing user accounts from the command-line only in the Content server documentation.
If you were trying to connect one running calibre instance to another or to share a database between two running calibre instance? The first is not doable, the second is a great way to corrupt your calibre library.