I know it was a tremendous effort creating the newsletter and related functions.
Thanks for your hard work!

However, I don't want the newsletter, is there a way to disable it?
Not shown at all.
Is it as simple as rem the code?  Where?

I just don't have time for a newsletter.

Put somewhere in your css:

section#box-newsletter-subscribe {
     display: none;
}

Do you know the Path and filename by chance?

Try adding it in this one
/includes/templates/default.catalog/css/app.css

Also in Admin/Edit Styling add at the end:

box-newsletter-subscribe {display:none}

and save

I tried jackmaessen's suggestion, then tried vilaipon's suggestion.
I used vilaipon's suggestion because it was easily accessible without have to ftp and upload.

Worked perfectly...

Thanks everyone for the help!

I tried the same, but it only worked with this:

To remove the newsletter box on the front page, remove this line:
https://github.com/litecart/litecart/blob/2.6.2/public_html/includes/templates/default.catalog/pages/index.inc.php#L17