You need to provide Metadata URL. Its an url to the file with SAML configuration.
For example, if you want to use Google SSO - you will need to set up SSO in Google admin panel, after that you can take the needed URL and put it in Workato.
Right, What Yan Romanenko said.
First you need to configure an "app" in your identity provider. Once the app has been added to your identity provided, you can copy the needed configuration info into Workato.
There are step-by-step instructions for configuring SAML witht the most common Identity Providers here: https://docs.workato.com/user-accounts-and-teams/single-sign-on.html#workato-single-sign-on-setup