Message Box for a Report

I have a form that has options to choose different reports. I want to add a
comment to certain reports.
What I would like to happen is when I click on a particular option a message
box appears and the message box has " Enter the comments below." and then you
have a box to enter the text you want. Once you enter the text then it will
print the chosen report with this comment on the report.
Would I also have to have a text box on the report that will accept this text?

Or do you have any suggestions of an easier way or the proper way to achieve
this.

Thanks,
Curt