This guide shows you how to use Windows Azure Active Directory Access Control (also known as Access Control Service or ACS)
Requirements:
- Visual Studio 2012
- Identity and Access tool
- An active Windows Azure account
Lets start by configuring the Windows Azure part first.
- Open dashboard
- Click Active Directory
 
- Click New from left bottom and fill in the name and choose region
 
- Choose your subscription and click Manage from bottom 
- Take up your Service Namespace. In my case "tapanilablog"
 
- Click Management Service from left and then ManagementClient
 
- Click Password
 
- Click Show Password and take up your Password there's needed later
 
- Close your ACS management page and go back to dashboard
- Click Web sites
 
- Create new web site
 
- Download the publish profile and take up the url
 
Now the Visual studio part
- Create new web project. Check that you are targeting .net 4.5
 
- Right click your project and choose Identity and Access
 
- Select "Use the Windows Azure Access Control Service"
 
- Click Change from below
 
- Enter your ACS namespace and management key that we got before
 
- Choose which providers you want to use with your application and Enter your realms and click okay
 
- Right click project and click Publish
 
- Import your publishing profile
 
- Click Publish
 
- Now it should open your website and automatically redirect you into Live login because that's the only method. After your login is completed it will show you "Server Error in '/' Application. Because we used empty project
Update 29.7.2013: If you have Runtime/Server issues when you have deployed this to Azure follow this guide.