I can't print the e-mails.how can i add yahoo!mail to my popup blocker's of allowed sites?

when i try to print a e-mail it's shown a message :"the new window appears to have been blocked by a popup blocker.for best results we recommend that you add your yahoo!mail to your popup blocker's list of allowed sites.some popup blockers will temporarily allow a window if you hold down the ctrl key".end of message.please send me a message with the answer because i really need to print some e-mails.thank you nico