how to modify wysiwyg + ckeditor config?

Hello, I’m using wysiwyg with ckeditor and I’m wondering how to add the following to the ckeditor config:

config.fillEmptyBlocks = false;

I found the following topics about it:…

but I couldn’t make sense of these answers because they require prior knowledge, and they don’t explain how to implement these solutions. For example “make a custom module” or “create a hook”… no information about what files to create or modify.

then I found this page:

but installing their drupal 7 custom ckeditor module caused many errors in my drupal installation, and the ckeditor toolbar dispappeared from text fields.

So could someone please explain how I can add the above config line to ckeditor config used in wysiwyg module ?
thank you!

Drupal version: