hdaccess 0 Newbie Poster

I am currently making a subreport and I found it very tricky to do. I already created a parameter(ID) that would link Report2 to Main Report but still it doesn't work. I have two datasources: LoanerDataSet for the main report and LoansDataSet for report 2. I would like to ask for a step by step procedures of accomplishing this. Currently, I am encountering this error: Subreport could not be shown. Any help is much appreciated. tnx