An Assertion Consumer URL, also known as a “Circle of Trust,” is an endpoint on the service provider where the identity provider redirects with an authentication response. If your SAML application has more than one Circle of Trust, you can add them to existing applications by putting the application in Edit mode.
Add the URLs
On the navbar, expand
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Apps and Authentication > SSO Connections and click SAML.
Search for the application you want to which you want to add the URLs and click the Display
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Name for it.
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Click the Edit link on the Connection Details page.
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Scroll to the Assertion Consumer URL / Circle of Trust pane and click the Add New button.
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Enter the information for the URL and save your changes.