...

Type the hostname of your AD FS server in the import Metadata step. Importing metadata using the AD FS hostname host name is recommended, as it allows for automatically updating certificates. 

If your server does not have network access to the AD FS server, please download the metadata file from this URL using a browser:
https://<adfs-server.example.com>/federationmetadata/2007-06/federationmetadata.xml
and then upload the metadata file in the “Upload metadata XML file” area.

...

4. Redirect URL

No need to do anything. The Redirect URL is automatically fetched from the metadata you imported in the previous step.

...