If a misspelled word is flagged with a red underline, tap it to see replacement options . To configure the spell checker, tap Settings > Language & Input > Spell Checker. You can toggle the spell checker or set additional options by tapping .
Tap one of the alternative spellings to replace the misspelled word. If the word you want doesn’t appear, just retype it.
Your personal dictionary contains a list of words that you don’t want to be autocorrected or flagged as misspellings. The dictionary starts out empty. Words are added to it when you tap Add to Dictionary in the spell checker , but you can also edit the dictionary manually: Tap Settings > Language & Input > Personal Dictionary.