How do I add Yahoo Mail to my blocker's list of allowed sites?

I have A V G 2008 AS MY ANTIVIRUS program. I just installed a Lexmark printer model X7170 but I can not print my mail from Yahoo because of a pop up blocker.
I hope this all makes some sense to you.
Thanks in advance for your help.
Richard
Update: I have vista home edition
3 answers 3