Create parameter month and year, count total records

Hi,

I'm a newbie in crystal report. I need to create a summary and detail report.

Question 1: For the detail report, the user wants to enter Month and Year in the parameter and display records within that month and year. How can I do that?

Question 2: For the summary report, I try to create cross-tab as attached. I want to display count of user id by monthly in data field. The problem is how I can get data in month year instead display as date in the cross-tab and also how can I add calculation of grand total? The user need to enter year parameter and data display like below pictures.

Please help.

Thanks.