I have roadrunner Webmail. For some reason my email only shows up on my iPad. My PC shows no email. Thanks for your help.
RoadRunner seems to be owned by TWC, and uses their servers. If this is the case then the account is a POP account.
POP accounts are very simple. They were created before people were likely to own more than one computer or device. Instead of maintaining folder, inboxes, or your mail on the server, the account simply has a pile of your email. When your device or computer accesses the account the email is downloaded to that device or computer. The POP server then does one of two things. It keeps the email (though it will 'probably' be invisible to the device that downloaded it), or it deletes the email from the server.
If you typically use the iPad to get your email, and it is set to delete after downloading, then your computer will never get those emails.
To change this go into Settings > Mail, Contacts, Calendars; and select your account. You'll need to drill down until you find the setting that tuns on/off the delete-after-download option. I can't give you specific instructions, because I don't have any POP accounts, but tapping around on various things should get you there eventually. Be sure to tap on your actual email address, as that usually leads to the the Advanced settings.
What you don't want to do is turn off the delete-after-download on all your devices/computers. Most POP accounts have limited storage space, and you'll eventually lock the account up. So if you do most of your email checking on the iPad, then dig into your computer's account settings and run the delete-after-download there. Just remember that once you download the email on the computer it will no longer be available for the iPad to download.
Also, neither device will stay synced. The iPad will have no idea what emails you've read, deleted, or otherwise molested on the computer, and vice versa. This is the nature of POP accounts.
In the end POP is just a lousy choice for most people who have and use multiple computers and devices. I heavily recommend getting another email account that is not associated with your ISP and is IMAP or Exchange based. Gmail, iCloud, Hotmail, and Yahoo are the most obvious choices, but there are others.
There are two main reasons for this.
One: Your email will stay synced across all devices and computers. No need to wonder what email ended up on what device and in what folder.
Two: If you ever change your ISP (Internet Service Provider), for whatever reason, you lose that email address. Since email addresses are also used as usernames (Apple ID), notification messages (expiration of service notices, bills, etc.), and in some cases security confirmation (confirmation emails); changing your ISP becomes a major chore of hunting down everywhere you've used that address and updating. Forgetting can result in anything from missing important emails to losing access to other accounts (because you can reply to a confirmation email).
Better to switch now, while you can control the situation and catch anything that you missed over a period of months or even years.
Anyway, that's how I feel about it, and the advice you'll get from many others who have experienced the pain of having to switch ISPs.
Good Luck.