Currently Being ModeratedMar 27, 2013 6:26 AM (in response to Cathyegland)
You can just use safari and go to mail.yahoo.com like you would in any browser.
You can also use the free Yahoo Mail app (P.S. on your iPad, the Yahoo app will be under iPhone apps as it is optimized for the iPhone screen).
Or go to settings, under "Mail, Contacts, Calendars", select "Add Account" and set up Yahoo mail in the iOS Mail app. The add account wizard will walk you through the setup.