How to use internal variables in Report Builder Textboxes
Ok, found out that if you're using SSRS, you cannot declare variables in the query and expect to use them on the layout of the report.  If you do, you need to declare and set the values in SSRS, not in the query.

Here is the page I used to set dates for start and end dates for the variables through SSRS:  https://social.msdn.microsoft.com/Forums/sqlserver/en-US/a62672c2-4005-4dc6-935f-7c90e9e55491/ssrs-expression-retrieve-last-week?forum=sqlreportingservices