Apple's Mac OS X has a built-in spell check function available in many text-oriented apps, including Pages, Notes and Stickies. Web browsers such as Safari and Chrome also have this feature. You can set spell check to work automatically as you type or use it on command from the menu.
Open an app on your Mac, such as Pages.
Click the Edit menu and select Spelling and Grammar. Enable Check Spelling While Typing if it isn't already activated.
Open a text document. Mac OSX underlines mistyped words in red.
Click near the end of a misspelled word to see suggested correct spellings. Click one of the suggestions to correct the mistyped word.
As an alternative, double-click the mistyped word to select it, then right-click the word. Click one of the suggestions from the resulting menu to fix the spelling error. For slang, jargon and other words that may not be known to your Mac, click Learn Spelling to include it in the Mac's internal dictionary, or click Ignore Spelling to ignore the error for now, but treat it as misspelled in the future.