Settings > Language and Input > Spell
Check.
If spell check is turned on, spelling mistakes are underlined in red as you type.
You can change spell check settings, such as whether to check the spelling of acronyms, whether to correct the casing of words, and so on.
Settings > Language and Input > Spell
Check.
When you use spell check you can add words that are marked as incorrect to a custom dictionary on your BlackBerry device so that spell check recognizes them as being correct. The words that you add to your personal dictionary can be edited at any time.
Settings > Language and Input > Spell
Check > Edit Personal
Dictionary.
.
.
Tap
next to the word that you want to delete.