Open the copy. And go to the script editor.
Click the trigger button.
In the next step, click Add Trigger.
Here you make sure that onEdit in the first field is selected and in the last field you select onEdit. Click Save.
Once this is done, the script will start logging everything that happens in all cells. Each cell shows the last 5 events. The script works in all sheets in your document. For example, if you have an existing sheet, you can copy the data into this document.