Is your report based on a query?
If the query is a parameter query, then you can use the contents of fields in your form for parameters.
However, you say it prompts you for a couple of other things and that could mean there´s something wrong with the query. I´m not very good at reports but I´ve had similar problems with forms. In my case, I had changed some names of the fields so the form had fields in it that no longer existed.
Fuga.