Using the ‘Display App Name’ text field in the Plugin, you can change the text on the SSO button displayed on the wp-login page or the SSO widget that you have added on your WordPress site.
Go to Plugin Settings, in the Configure OAuth tab, you can see the Display App Name input field. You can enter the text which you want to show on the SSO button/widget.
Now, go to your WordPress Login page. (Eg. https://< your-WordPress-domain >/wp-login.php) and you will see the SSO login button there.