Below are the steps to enable/disable the spell check feature:

1. Open Paper Tiger application.
2. Go to View menu and click on "Preferences" option.
3. In User Preferences window, click on "General" tab. (Refer Image 1)
4. In that you can find option "Disable Spell Checker" option. (Refer Image 1)
5. Select that option and click on "OK" button.
6. Then the spell checker feature is enabled/disabled.

                                                             Image 1