Enable Automatic Login for OS X El Capitan

The Problem

I just did a fresh install of OS X El Capitan. However, I tried enabling automatic login, but it stays locked. It was frustrating.

The Solution

1. Go to System Preferences, select Security & Privacy to turn off FileVault for the disk.
2. Go to Users & Groups and click Change Password
3. Instead of using my iCloud password to log in and unlock this Mac, choose to use seperate password.
4. Set my new password
5. Click Login Options and enable automatic login for my account.

Yay, it worked out!