Hello, I am looking to setup a connector to connect to my trailhead salesforce instanse.  Where can I find that URL to put in my connector properties and then I can add my user name/passworkd to log into it

Hello, I am looking to setup a connector to connect to my trailhead salesforce instanse.  Where can I find that URL to put in my connector properties and then I can add my user name/passworkd to log into it