adding a FILTER function, using an inclusive range in a subselect

here is my current code and im very new to MDX and playing ard.

SELECT NON EMPTY { [Measures].[Affiliations Count], [Measures].[Practitioners Count] } ON COLUMNS,

 NON EMPTY { ([Associations].[Network].[Network].ALLMEMBERS * [Associations].[Health Plan].[Health Plan].ALLMEMBERS ) } DIMENSION PROPERTIES MEMBER_CAPTION, MEMBER_UNIQUE_NAME ON ROWS

 FROM ( SELECT ( STRTOSET("[All]", CONSTRAINED) ) ON COLUMNS

 FROM ( SELECT ( { [Associations].[Record Type].&[Practitioner] } ) ON COLUMNS

 FROM ( SELECT ( -{ [Associations].[Health Plan].&[] } ) ON COLUMNS

 FROM ( SELECT ( { [Affiliations].[Affiliation Par].&[True] } ) ON COLUMNS

 FROM ( SELECT ( { [Affiliations].[Affiliation Incomplete].&[False] } ) ON COLUMNS

 FROM ( SELECT ( { [Affiliations].[Affiliation Active].&[True] } ) ON COLUMNS

 FROM [FusionCore]))))))

 WHERE ( [Affiliations].[Affiliation Active].&[True],

 [Affiliations].[Affiliation Incomplete].&[False],

 [Affiliations].[Affiliation Par].&[True],

 [Associations].[Record Type].&[Practitioner],

IIF( STRTOSET("[All]", CONSTRAINED).Count = 1, STRTOSET("[All]", CONSTRAINED), [Associations].[Corporate Plan].currentmember ) )

 CELL PROPERTIES VALUE, BACK_COLOR, FORE_COLOR, FORMATTED_VALUE, FORMAT_STRING, FONT_NAME, FONT_SIZE, FONT_FLAGS

I have been trying to add a filter funtion or date range in subselect, but not able to achieve or get what i want.

How can I add a line to handle a date range from today through 30 days from now forward?