Please take a look at configuration in the script:
/**************************************************************************
* Configuration
*/
-- filegroup from which tables will be removed
SET @SRC_FILEGROUP = 'PRIMARY'
-- filegroup to which tables will be moved
SET @DEST_FILEGROUP = 'FG_DATA'
-- schema, for which the action will be done
SET @SCHEMA_NAME = 'stage'
/*
* End Configuration
*************************************************************************/