OS X comes with an integrated WebDAV client that is built into the Finder. You can connect to WebDAV servers the same way you connect to other servers.
To establish a connection, choose “Go” and “Connect to Server..” from the Finder menu bar.
Enter the WebDAV server’s address in the dialog and click on “Connect”.
It will ask you for your user and password, enter your autorouter login credentials here. Now you should see the base folder which allows you to interact with the server just the way you do with local files.