How to display text in CKEditor?

The CKEditor has a SCAYT funtion to it, you just need to turn it on. Otherwise I'd suggest using something like the Grammerly Chrome plugin to check your spelling and grammer.

Thanks, probably It can be helpful, but I meant changing the old text to the new one. I know I can do this in Custom Tables, I can also use Scayt but I want to add a control that will allow me to improve the text on the page. I'd like to use CKEditor and do not know how to display the text there?

On your custom table, set the field's data type to Long text, then set the form control to HTML or WYSIWYG editor.

I know that. I have a working Custom table. Is it possible to use Custom Table Form to edit the existing record? If not I'd like to build my control that change, improve some records.

Unfortunately, your initial question and subsequent answers weren't very clear but yes you can use the custom table form to edit a record in the Custom Table app. If you want to use it on the public facing website you can use or modify this webpart on the marketplace.

I work on version Kentico 12. The proposed control is from version 10. Can I install it?

warning from Kentico: The system supports import of packages only from the current or previous major version. The selected package is from Kentico version 10.0. Errors may occur during the import process.

I've not tested it in v12 but you can import it and see what happens. If it doesn't work you can modify the code pretty easy to fix it.

Thanks, except for this warning everything looks ok.