I installed the addon, following the readme.html file's instruction.

When I tried to do step 5 in the file, which is:
(Optional) You can change the folder in which the editor file live, by renaming the folder and adding the following line to your admin/includes/configure.php file:
define('DIR_WS_EDITORS', 'the new name of your folder');

So, I renamed the folder to 'myeditors', then added a line in that configure.php like:
define('DIR_WS_EDITORS', 'myeditors/');

Then I went back to step 4, which is:
(Recommended) You can also set your default editor choice via Admin->Configuration->My Store->HTML Editor (note: this may not take effect until you log in the next time)

I got the following error msg with yellow background on top of the admin panel:

You have an HTML editor selected in 'My Store' but the '/editors/' folder cannot be located. Please disable your selection or move your editor files into the '/shoppe/editors/' folder

I am not sure if I missed something, please help.

However, when I used Define Pages editor and EZ-pages editor, the CKeditor did show up. So I guess the function is there, but the msg is always stay, which is kind of an...ing

I am using zen-cart 1.3.9h, thank you.