It is tricky getting it set up for Roadrunner. Unfortunately, I did not save instructions for what I did once I figured it out, but I'll give it a shot.
Address = your email address
Description = whatever you are going to call this email address - only important if you are setting up multiples
Incoming Mail Server
Host Name = pop-server.yourcity.rr.com
where yourcity = whatever rr geographic location you are in
User Name = login (part before the @ in email address)
Password = xxxxxxx
SMTP
smtp-server.yourcity.rr.com set to ON and then select that section to keep going
Host Name = smtp-server.yourcity.rr.com
leave User Name and Password = blank
Use SSL = leave OFF
Authentication = set to Password
Server Port = 587 (that # is important)
then select DONE
Now go to ADVANCED
Incoming Settings
Use SSL = leave OFF
Authentication = Password
Server Port = 110 (again, important #)
If these do not work for you, try the thread below, you will get some info, but as I recall, I still had to go elsewhere for the solution.
http://www.ipadforums.net/ipad-help/3635-cannot-successfully-set-up-roadrunner-email.html
Also try the info posted here:
Apple - Support - Discussions - Search Discussions