Best Way To Set Up Report

I am having an issue with setting up a report that has the data coming from a stored procedure on SQL Express 2008R2. The data is being loaded fine into two tables placed into a dataset. Now the problem is with designing the report to display that data. I can't seem to attach the stored procedure in order to place the fields on the report. I have also been unsuccessful in using the unbound fields so far. Can someone provide some guidance?