From within your course, click on Assignments. Click on the "kebab" menu to the right of Assignments and then click on TurnItIn. Give the assignment a title, description, start and end dates, score, any optional settings you wish. Click Submit. Click the publish icon so the assignment is visible to students. Now we need to add it to a module so students can see it. So click on Modules. Locate the correct module. Click the plus in the module to add a new item to the module. Set the add dropdown to Assignment. Select the assignment you just created and click Add Item.