To change your headline, follow these steps:

1. Go to your profile
2. Click on the "Edit Profile" tab (fifth tab)
3. Click on the "Edit Profile" icon located at the top right hand corner
4. Scroll down to "Education" and or "Career" and select the one that best applies

Please note that if you want a specific education and or career to show under your headline, you will need to update your education and or career on Facebook and give it 24 hours for it to reflect on your profile.