You can create a new theory page in two ways.
The first way is possible when you have just created a subchapter. Then, you can immediately create a theory page by clicking the button "Create theory" on the "Edit subchapter" page.
Create a theory page from the Author environment.
Creating a theory page from the Author environment
Click on the "Theory" tab, and then on the "New" button:
You will now see a page where you can fill in some general options for your theory page.
Name: give your new theory page a name.
Position: you will see two labels and at first just one input field. For the one on the left, labelled "Chapter", choose within which chapter you want to create this theory page. After that action, you will now see a second input field, labelled "Subchapter". Here, choose within which subchapter you want to create this theory page.
If you started creating the theory page using the button in the "Edit subchapter" page, then these fields are already pre-filled.Status: do you want to publish your theory page already? Publishing it means that your theory page can be used by teachers, and subsequently by students. Is it just a draft? You can leave it unpublished, but remember to publish it when you're ready!
Click "Next" when you are done filling in the general options. You will now see the editor for theory pages. Read more about it here.