Open System Preferences from the Apple menu or Dock, click on International, click the Input Menu tab. Make sure "Show input menu in menu bar" is selected. You should see a menu appear (probably a flag icon, representing your default or chosen keyboard), in the right-hand side of the menu bar. This is known as the input menu. If you pull down the input menu, you should see Spell Catcher as one of the items.
“Sorry to say, I don't see Spell Catcher in the input menu.”