Need help printing my envelopes

Hey ladies - I've been working on my pocketfold invites - I have to say that so far I am extremely happy with the way they are coming out...but I'm hitting my head against the wall trying to figure out how to do the envelopes.

I have the envelopes for the response cards and the enveloples that the whole invite will be sent in - can anyone PLEASE help me with this??? I appreciate any help that you guys can give me!!!

Thanks in advance!!