Turnitin requires that all users making a submission accept the latest End-User License Agreement (EULA). This includes users who have used Turnitin previously as well as users who are new to the service. The latest EULA appears in a pop-up window in all internet browsers.
When making a submission to Turnitin, you will be asked to accept the latest EULA (see below):
When you now click on the link to accept the latest EULA, the EULA should appear in a new tab. Click 'I agree -- continue to complete the process and make your submission.