How to set automatic deletion of old messages on my BlackBerry Curve 9300

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The Keep Messages feature lets you specify the number of days to keep email messages, text messages and PIN-to-PIN messages. After this period of time, messages are automatically removed from your BlackBerry® smartphone.
The Keep Message option does not remove messages from:
Your integrated email account (if you're using BlackBerry Internet Service)
The messaging and collaboration server (if using a BlackBerry Enterprise Server)
1. Select Messages.
2. Press the Menu key.
3. Scroll to and select Options.
4. Select General Options.
5. Scroll to and select Keep Messages.
6. Select the required option (e.g. 15 Days).
7. Press the Menu key.
8. Select Save.
9. The keep messages time period has been set.