To be able to configure and use the block, you first need to setup SAML for your Softr app. You can learn what SAML is and how to configure it on Softr here.
Please, note that the feature is available only for Business plan customers.
Under the Features tab in block settings, you can customize the Logo, Title, and Background Image of the signin block.
Logo, Title, and Background Image settings
Next, you can enable Domain-based signup and customize the login button text. Finally, there's an option to set which page the user should be taken to after successfully signing in.