Here's how you can create new items directly from the legacy content editor.
1. Open the item list
2. Click on "Create New Item"
3. Name your item, or items
You can list multiple items at once if you are adding items in bulk. You can also nest items using hyphens to represent your content hierarchy, adding main pages and sub pages at the same time, for example. You can find detailed instructions about how to do this next to the input field.
4. You can choose to assign a parent to the new item
Choose to nest your item(s) underneath a parent item. You can re-order items at a later date if you need.
5. Choose what Template to apply to the item
You can also choose to create a Blank item, which has no structure, or to add a Template that you have saved yourself.