Help with parameter

[Anonymous]

Hello,

I have a report calculating how many hours an employee works.  It has a formula that like:

SUM(Regular Hours) + SUM(Extra Hours) - Lunch Deduction.

I need to find out from the user what the lunch deduction is, so I"ve created a parameter with values .50, 1.0, 1.5, etc.  But now I don't know how to use this parameter on the report.  How do I display it, and how do I grab the value and add to my formula?

Thanks.