I have big SQL Server database, with a lot of blob data in some tables.
For performance optimization, I want to move one table to separate hard drive.
I created new filegroup, and "row data" file.
But, I can't change any parameters in table properties: they are all disabled.
And I don't know a way to enable it.
Can anybody help me?

CREATE INDEX ... ON newfilegroup WITH (DROP_EXISTING = ON). See the documentation. – Aaron Bertrand♦ Oct 28 '12 at 16:35