To configure the Yahoo! toolbar:
1.) Click on the reply or forward button of an email.
2.) Click on the Pop-up icon in the Yahoo! bar that has changed to an explosion icon and is highlighted by a red box.
3.) Click on Always Allow Pop-Ups From.. in the drop down menu
4.) This opens the Yahoo! Pop-Up Blocker window where you will see the webmail address listed. Click on the webmail address and then click on the Allow button.
5.) Click the OK button in the window that opens up to allow pop-ups from the webmail address
6.) Click Close to exit the pop-ups menu.