By default, live spell checking is enabled, and will display a squiggly red underline in the editor under words that are considered to be misspelled (not found in its dictionary). If you believe the word is spelled correctly, you can add it to your personal dictionary by right-clicking on the word and selecting Add from the pop up menu. On the other hand, if you know that it is misspelled, but don't know the correct spelling, you can also right click on the word and select the proper spelled version from the pop up menu (assuming there is a proper variation found in the dictionary). If you wish to turn off live spell checking, use the menu sequence Setup ® Enable Live Spellcheck to toggle the state of live spell checking.