How do I turn off the autocorrect function on BBM for 9320?

Depends on OS level but this may help. It's an all or nothing option on my phone

To change the predictive text, complete the following steps:
On the Home screen of the BlackBerry smartphone, select Options > Language and Input Text.
For Input Style, select Auto Correction.
Select Show Text Input Options.
Under the heading Learn Words From Email Messages, select Off.
Uncheck Predictive
Press the menu button and select Save.
On the Language and Input Text screen, press the menu button, and select Save.


KB12781-The difference between the Auto Text and Auto Complete features