PowerVault MD3200 - add drives

One of my customers has recently run short on drive space with their PowerVault MD3200.  The first 8 slots have 600GB SAS drives populating them.  These drives have been placed in a RAID 10. 

There are still 4 open slots that do not have drives installed.  We have 4 2TB drives that we want to use in these slots and we want to setup a RAID 5 with these 4 drives. 

What is the best method to get this done?