McNemar Test HELP!

Please forgive my ignorance and sophomoric knowledge of this but I only know of this test that is used for multi-conditions.

I have a 3x3 table that has condition 1 and condition 2

Can I use a McNemar test on this and if so how. If not what is the best thing to do on this?
I am testing the affects of a political ad on opinion. I ask if they agree or disagree with a policy. I then show an ad in support of the policy. I then ask if they agree or disagree with the policy. The problem is that all I know how to do is a 2x2 table. the answers i have are Agree, Indifferent or Disagree.