Please visit this article to learn what Turn In means
As long as your instructor has the assignment options set to allow "Flexible Turn In" and it is before the due date, you will be able to Turn In your attempt from multiple locations.
From the My Results page
At the top of every page on Shadow Health, you should see "My Results". Clicking this will bring you to your Student Results Book page where you will see a summary of all assignment attempts you have in your course.
On the right side of the page you should see a gear icon that when clicked will allow you to either Turn In or Reopen your attempt.
From the Assignment Overview page
When on the Assignment Overview page, the second section named Attempts will show you information about all of the attempts you have for the assignment. On the right side, you should see the Turn In option.
From the Experience Overview page
When on the Experience Overview page, you should see the Turn In button across the top regardless of which