This allows everyone that receives the document to edit the content you selected. Once the text is selected, head back over to the “Restrict Editing” pane and tick the “Everyone” checkbox under the “Exceptions” section. If you have specific content in two separate sections that you’d like to keep open for editing, hold the Ctrl key while you click and drag to add them to your selection. Go ahead and select the text by clicking and dragging your mouse across the text.
Whatever parts you don’t select will end up as read-only.
Now, you’ll need to select the parts of the document for which you do want editing allowed.