To access the login page explicitly as SAML performs an automatic redirect to the SAML login, you can specify the URL in below format.
Artifactory 7.x and above:
https://<artifactory-contextg-url>/ui/login
Example: ”https://myartfiactory.jfrog.io/ui/login"
Artifactory 6.x and below:
https://<artifactory-context-url>/webapp/#/login
Example: https://myartifactory.jfrog.io/artifactory/webapp/#/login
This will then allow your internal users to use their credentials to login avoiding the SSO provider.