Change to user input prompt?

This is the SQL:[code]SELECT DISTINCT person.MembershipNumber, person.FirstName + ' ' + person.LastName AS NAME, person.FirstName, person.RegionId AS REGION, addr.StreetOne, addr.StreetTwo, ISNULL(unit.Description, '') + ' ' + addr.SubUnit AS 'Unit', addr.City + ', ' + addrState.Code + ' ' + addr.PostalCode AS 'CityStateZip', addrState.Code AS 'State', lookup.Country.Description AS 'Country', CONVERT(char(10), pm.EndDate, 101) AS EndDate, addr.PostalCode, pm.HomeClubFROM (SELECT attribute.PersonMembership.PersonId, ISNULL(org.OrganizationName, N'Individual') AS HomeClub, attribute.PersonMembership.MembershipTypeId, attribute.PersonMembership.InvoiceNumber, attribute.PersonMembership.EndDate FROM attribute.PersonMembership LEFT OUTER JOIN USFSA.dbo.SOP10100 AS invWork ON attribute.PersonMembership.InvoiceNumber = invWork.SOPNUMBE LEFT OUTER JOIN USFSA.dbo.SOP30200 AS invHist ON attribute.PersonMembership.InvoiceNumber = invHist.SOPNUMBE INNER JOIN lookup.MemberTypes AS mt ON mt.Id = attribute.PersonMembership.MembershipTypeId AND mt.MemberGroup = 'Regular Member' LEFT OUTER JOIN entity.Organization AS org ON org.Id = attribute.PersonMembership.OrganizationId WHERE (attribute.PersonMembership.CreatedDate > DATEADD(day, - 120, GETDATE())) AND (SUBSTRING(invWork.BACHNUMB, 1, 8) >= '20150601' AND SUBSTRING(invWork.BACHNUMB, 1, 8) <= '20150710' OR SUBSTRING(invHist.BACHNUMB, 1, 8) >= '20150601' AND SUBSTRING(invHist.BACHNUMB, 1, 8) <= '20150710')) AS pm INNER JOIN entity.Person AS person ON person.Id = pm.PersonId LEFT OUTER JOIN lookup.TitlePrefix ON person.PrefixId = lookup.TitlePrefix.Id AND lookup.TitlePrefix.Id > 0 LEFT OUTER JOIN lookup.TitleSuffix ON person.SuffixId = lookup.TitleSuffix.Id AND lookup.TitleSuffix.Id > 0 INNER JOIN attribute.Address AS addr ON person.PrimaryAddressId = addr.Id LEFT OUTER JOIN lookup.AddressSubUnit AS unit ON unit.Id = addr.SubUnitTypeId AND addr.SubUnitTypeId <> 0 LEFT OUTER JOIN lookup.State AS addrState ON addr.StateId = addrState.Id LEFT OUTER JOIN lookup.Country ON addr.CountryId = lookup.Country.Id AND addr.CountryId > 0 AND addr.CountryId <> 42ORDER BY addr.PostalCode[/code]How do I change this for user input for the date range?[code]WHERE (attribute.PersonMembership.CreatedDate > DATEADD(day, - 120, GETDATE())) AND (SUBSTRING(invWork.BACHNUMB, 1, 8) >= '20150601' AND SUBSTRING(invWork.BACHNUMB, 1, 8) <= '20150710' OR SUBSTRING(invHist.BACHNUMB, 1, 8) >= '20150601' AND SUBSTRING(invHist.BACHNUMB, 1, 8) <= '20150710')) AS pm INNER JOIN[/code]