If your Modules page in a course includes a requirement to mark the page as done, you must mark the page before you can progress to the next item in the module.
Marking a content page as done means that you understand the course material in the content page and are ready to progress to the next item.
Click the Mark as Done button.
If you want to unmark the page as done, click the Done button. The button will turn back into the Mark as Done button.