Editing PHP files causes crashing

I edit shopping_cart.php with either Firstpage or Notepad and I get a white page or a crash - I am able to edit other files with these programs and it works.

I am trying to to remove the message ...............

You may want to add some instructions for using the shopping cart here. (defined in includes/languages/english/shopping_cart.php)

altering a single byte in the file causes a similar crash

a similar problem occurs in the new account log in php file

any advice appreciated

site is https://www.notabenebali.com

Best

Nat

Assuming you're doing it right (removing the text in that define and leaving the single quotes) it should be OK with either of those programs. Are you just removing that text, or replacing it with something else?

For define pages, you can edit directly in admin->tools

https://www.zen-cart.com/tutorials/index.php?article=82
https://www.zen-cart.com/tutorials/index.php?article=87

To all of you who replied to my trivial response - many thanks for your time and interest.

The problem was in fact editor caused (adding junk to the php file)

It's very gratifying to see such community support

Thanks

Nat