ServiceNow supports Single Sign-On (SSO) which allows users to authenticate themselves against an external Identity Provider (IdP) rather than obtaining and using a separate username and password stored in the ServiceNow instance. Here are the steps to log out and log back in using SSO:

1. To log out from ServiceNow using SSO, you can simply click on the logout option in the user menu. This will end your ServiceNow session.

2. However, depending on the SSO configuration, you may still be logged into your IdP. To completely log out, you may need to also log out from your IdP. This process varies depending on the IdP used.

3. To log back into ServiceNow using SSO, navigate to your ServiceNow instance URL.

4. If SSO is properly configured, you should be redirected to your IdP's login page.

5. Enter your IdP credentials.

6. After successful authentication, you should be redirected back to your ServiceNow instance and logged in.

Please note that the exact steps can vary depending on the specific SSO method and IdP used. If you're using a specific SSO method like SAML or OAuth, or a specific IdP like Okta or ADFS, the steps can be slightly different.

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