How the User Dictionary functionality works?

Users can add any word to their personal dictionary clicking the Add word command in the Dictionaries tab of SCAYT dialog or Spell Checker dialog. 

To add a word to a personal user dictionary in SCAYT plugin for CKEditor 4:  

1. Click the ABC icon to display the drop-down list and select Dictionaries command. 
2. Type the word in the Add word field and click Add word and then click OK. 

To add a word to WSC dialog plugin for CKEditor 4: 

1. Click the ABC icon   to open SpellChecker dialog. 
2. In the Spell Checker dialog which opens, navigate to the desired word. 
3. Click the word to display the suggestions and click Add word button.   

To add a word to WProofreader:

1. In WProofreader, hover over a marked misspelled word to see the suggestions balloon.
2. Select Add word command.