Follow this step :

click menu => my profile => edit profile => contact

1. Click my profile

2. Click edit profile

3. Click contact

4. enter email then click update

5. enter security question

6. enter seurity code then save changes

7. after that you can see this

your verification link was sent to your email inbox

8. go to email inbox (use browser/operamini)

9. click verification link there

congratulation, your id now have eksternal mail





this for j2me user, but for other device almost same, just acces menu > profile > edit profile > contact. good luck ^_^