Removing FileVault master password

I forgot my FileVault master password and am trying to delete so I can replace with a new password (i don't have anything in there...).
I did some web search and found out that I need to remove FileVaultMaster.cer and FileVaultMaster.keychain in my computer's main/Library/Keychain folder in order to do this.

I don't really know that much about unix commands. Took me an hour to figure out that I needed to go up with cd .. command (didn't know there were many keychain directories).

I fooled around and located the files but the terminal wouldn't let me remove them. it asked if i wanted to override root/admin and whatever i type in it either responds with a denial or just moves on and doesn't let me remove the files.

Not sure what to do?

Any help would be greatly appreciated. Thanks.