Quick! I need help!

A Bad day so far, but this could make it that much cooler.. I'm working on my databases all day! :) Woohoo!
Anyway, my question for all you computer gurus is this-
I want to run a query to show results of a Yes/No checkbox on my main table.
In the Criteria window, what should my command line be for getting this information?
For example, if I wanted to see how many jobs were marked as completed, and its a yes/no checkbox on my main table.. how would I design the command for Access to prompt me for the yes/no request, and then pull the data for the response I need?
Please help!!!
Thanks yall
More on the week later :)