1. Press the Home
key to go back Home.
2. Next open on the application list.
3. Then tap on Email.

4. Then from the inbox screen tap and hold on the desire message.
5. Next select the Change Labels.
6. Now select the label you would like to apply to the message and tap on Ok.
To add add a star to a message simply in step 5 select Add star instead of selecting Change Labels. You should see a star appear next to the message.

Did you like this tip? {fblike}
Apply Filter to messages
1. While you are on the inbox screen, press the menu key.
2. Select Go to Labels.
3. Then to filter the messages that you want to view, select the appropriate label.