You can let MATLAB discover clusters for you. You need a working network connection between the client and the Cloud Center web services running in mathworks.com.
Use either of the following to discover clusters available for you to use:
On the Home tab in the Environment section, select Parallel > Discover Clusters.
In the Cluster Profile Manager, select Discover Clusters
Both options open the Discover Clusters wizard, where you can search for MATLAB® Parallel Server™ clusters.
Select On Amazon EC2 and click Next. MATLAB searches for clusters running on Amazon EC2. To access these clusters, you must provide your MathWorks Account login information. Clusters appear in the list as they are discovered.
Select the name of the cluster you want to use, and click Next. On the next screen, click Finish. If you do not want to set the new cluster profile as your default, you can clear the check box. You can set the default cluster at any time later using the Parallel menu. Parallel applications in your MATLAB session can use the desired cloud cluster by default.