CKEditor Insert HTML

Instead of myEditorID i tried 'editor', 'editor1', 'editor2' but still doesn't work for me.

You need to look at the HTML of your page and see what the ID field is for your editor. It will be something like this

<textarea id="my_editor"></textarea>

That id attribute is what needs to go in here

CKEDITOR.instances.my_editor.insertHtml('<p>This is a new paragraph.</p>');