Need your help with Report Builder - Oracle 10g

I have to generate report where i have to pass two parameters. The first on is where i have to enter a DATE and second where i have to enter the Company_Name that i want to pull records for.
I created User Parameter and in property inspectore i change the Input_mask, validate_triggers.
The problem that i am having is i dont know how to work with Validation Triggers.

Can anyone explain me how to generate this report by intering two parameter?

I need to generate this report asap i know there are great people out there please some one HELP:confused: me.
Your help could save my job.
Thank You.