Opt-in Samurai integrates only with self hosted version of SugarCRM
So assuming you already have it installed on your web server, please proceed with the instructions below
Go to your WP-Admin > Opt-in Samurai > 3rd Party Integration
Click Activate button under SugarCRM logo
The form below will ask for URL, Username and Password
Enter the necessary details of your SugarCRM installation. Make sure you DO NOT include /index.php in the url
Hit Save Changes button and you are done