How to disable password complexity rule in Active Directory (Windows 2008 R2)

1. Go to Start > run > gpmc.msc
2. Go to "Forest">"Domains" then expand the default domain
3. Right-click and edit the "Default Domain Policy". This will open a new window with title "Group Policy Management Editor"
4. On the "Group Policy Management Editor"
   go to "Computer Configuration">"Polices">"Windows Settings">"Security Settings">"Account Policies">"Password Policy"
5. Now modify the password complexity requirements setting. 
6. You have to then run "gpupdate" to propagate the changes.