MegaRaid controllers can be confusing and difficult because of the companies that keep on merging together. Currently, Broadcom maintains LSI equipment. But, in my opinion, they are being difficult recently and forcing you to get support through the OEM's. OEM's like Supermicro don't have much information either.
In any event, you can control the MegaRaid cards either:
-upon boot up with a CTRL+H
-or through the MegaRaid Management Software
Again, I would list more but this web site has more information than we can provide:
Upon installation, the login is the login of the computer you are using.
You can now manage your raid.