You may not. According to our STA, and EULA which must be accepted during the FTBU (First Time Boot Utility), the appliance may not be changed. In addition, the Dell limited hardware warranty, limits the hardware to an "as is" state, and no changes may be made without authorization.
Unauthorized changes may prevent Support from working on service request or warranty related issues until the appliance is reverted to the original factory delivered configuration (hardware and operating system).
Current authorized changes to DL series appliances are limited to additions of Quest sold MD trays for storage and Quest sold RAM for some DL series appliances.