Eprint with HP wirless printing from Iphone/Ipad

Ok I am going to take a deep breath before I try to explain this...

Today I just bought the hp all in phone photo smart plus b210 series

I CAN
printer from the mail app on the phone BUT

I downloaded the Eprint services app for HP, if you go into that app and click on mail

your options are as follows
gmail
aol
mobileme
other imap account

I signed in with my gmail and it works fine and I can print

BUT

my dad has an ipad and a YAHOO email address

I also have another YAHOO email address, this app doesnt give the option to use yahoo as one of the options to sign in. How do I sign in and make it work from yahoo?

I did come across something i googled that said it did work with yahoo, it was from the hp site but still can't get it to work


PLEASE HELP!!!!!!!! you will be my hero!!!!!!!!!

Hope this isnt to confusing