Note: While setup instructions are provided below, Gmail IMAP access is not officially supported for BlackBerry devices at this time.
To set up the BlackBerry's email client with Gmail (IMAP), just follow these steps:
1. On your BlackBerry device, navigate to your home screen
2. Select the icon that lets you set up email (this can be called Setup, Setup Wizard, Email Setup, BlackBerry Set-up, E-mail settings, or Personal Email Set-up)
3. Follow the setup instructions provided on your device
If setup is successful, you should receive a confirmation message and a new mailbox icon should appear on your device's home screen, labeled with your Gmail address.