Your phone shows you a notification message in the Events view, as soon as updates are available for your phone software or for individual applications. To view and to install the updates, just tap on the notification message.
You can also check for updates manually
1. Select Settings > Applications > Manage applications.
2. Open the Updates tab to see available updates and follow on-screen instructions
Note: It is recommended to use Wi-Fi for the update and create a backup using Nokia Link beforehand.