You will see the login page (this displays when you first installed the add-in or you have previously logged-out).
1. Enter yourNetsuite URL
2. Enter your Script URL
3. Click Continue button, another page opens
4. Click Connect to Netsuite button
5. Enter Netsuite Username
6. Enter Netsuite Password
7. Click Loginbutton
8. If 2-factor authentication prompt show, enter the code and click Submit button
9. The Authorization prompt opens, click Continue button
10. Click link to close prompt
If you are being asked for a Script url, it means that the Bundle Install has not been done for your Netsuite Account. If you are not the Netsuite Admin you may have to send this link to him > Setting up Connector for Gmail and Netsuite