Unable to 'Add to Contacts' from email received - Help!?

I've received a forwarded email. All the email addresses within the content are underlined. When I hover over them I have the option to open an email to the address, or to Add the address to my Contacts. When I click on the 'add to Contacts' I get a Yahoo Shortcut dialogue box that pops up with nothing in it. The function fails. Any help, much appreciated!