How to add object and procedure in a module?

Good afternoon to the community.
I saw the video "Learn How To create this amazing excel invice while I built it from scratch" but I have a problem.
How to create the object "Worksheet" and the procedure "Change"?
In my case I have just the object "General" and the procedure "Declarations"

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Thank you for your help.

You do not need to create the object for the worksheet, it exists by default in that module for that worksheet. All references to worksheet properties and methods are assumed to be for the worksheet that owns this module. Further the object Me can be used to explicitly reference the worksheet.

To generate the code for the Change event, you just need to click on Change in the dropdown list of Subs--you already have it highlighted in your screenshot.

I have added Worksheet_Change to the module for your Invoice worksheet. But what do you want it to do?

It looks like the second screenshot from your video shows it. In the dropdown box, click on "Change" and it will add the code automatically. You can also just type in the code, if you know what to type.