Forms :: Need To Count Number Of Records In Table Between Dates In Another Table

I have created a booking system for a set of resources for schools. Most schools have a membership which entitles them to 2 free sets. I have a booking form with a membership subform (membership table), and a booking details subform (kitloan table).

Once a school is selected on the main form, the membership subform shows the most recent record for that school based on schoolID.I want to display the number of sets they have already had within their membership period (can start at any time of the year, and lasts for 1 year) on the membership subform, so we know how many free ones they have left.

I therefore need to count the number of KitBkID (ID of the booking) in the Kitloan table where SchoolID = the SchoolID displayed on the membership subform, and the DateOut (booking date on kitloan table) is between the DateJoined and DateRenewal displayed on the membership subform (from membership table).

I can do this with a query which works when run and provided with the parameters SchoolID, DateJoined, and DateRenewal.

SELECT Count(Kitloan.KitBkID) AS CountOfKitBkID, Kitloan.SchoolID, Kitloan.DateOut
FROM Kitloan INNER JOIN Membership ON Kitloan.SchoolID = Membership.SCHOOLID
GROUP BY Kitloan.SchoolID, Kitloan.DateOut
HAVING (((Kitloan.SchoolID)=[Me].[SCHOOLID]) AND ((Kitloan.DateOut) Between [Me].[DateJoined] And [Me].[DateRenewal]));

What I can't do is get it to run on the form and take those values from the form.From the searching I've done, I'm thinking a DCount should be the way to go, but I cannot get the criteria right. I created a query (KitloanCountQry) so that criteria could come from both the kitloan and membership tables.

SELECT Kitloan.KitBkID, Kitloan.SchoolID, Membership.DateJoined, Membership.SCHOOLID, Kitloan.DateOut
FROM Kitloan INNER JOIN Membership ON Kitloan.SchoolID = Membership.SCHOOLID;

I have put the DCount as the control source for a textbox on the Membership subform (but have tried it in VBA too):
=DCount("KitBkID","KitloanCountQry")
This works but obviously gives me the total for all bookings.

[code]....

Although I have to admit to getting lost in the syntax. This produces #Error.