This submenu contains commands for text editing.
See the image below:

Let’s consider menu items and their purpose (top-down):
| Undo | Cancels earlier made and not saved text change. |
| Delete | Deletes the selection. |
| Cut | Cuts the selection and puts it on the Clipboard. |
| Copy | Copies the selection and puts it on the Clipboard. |
| Paste | Inserts the Clipboard contents. |
| Select All | Selects the whole text. |
| Find | Finds data. |
Also, you can use Edit toolbar.