Trying to change my email server settings ?

So I tryed to send a pic from the internet as an email and was promted to enter my email server to continue. I entered the wrong email server info and now that i have the correct server name i cant figure out how to change it.Trying to change my email server settings ?
The ability to access Yahoo! Mail using an email reader program such as Outlook, Eudora, or Thunderbird is only available to customers of our premium Yahoo! Mail Plus service. To determine whether you have purchased this service, please visit the My Services page.



Click here for information about subscribing to Yahoo! Mail Plus.



We’ve assembled the following instructions for configuring Yahoo! Mail Plus to work with many common email readers:





Use these settings to access Yahoo! Mail Plus using your favorite email reader.



Note: If you can't add new POP or new SMTP servers in your mail reader program, you need to change your current mail settings to access your Yahoo! Mail Plus account. Write down your current settings first—you may need to revert to them later if you want to use the same program to send and receive messages from your other email addresses.



Incoming mail server settings



POP server: plus.pop.mail.yahoo.com

Use SSL

Port: 995

Outgoing mail server (SMTP) settings



SMTP server: plus.smtp.mail.yahoo.com

Use SSL

Port: 465

Use authentication

Account Name/Login Name: Your Yahoo! Mail ID (your email address without the ';@yahoo.com';, for example, “testing80”)

Email Address: Your Yahoo! Mail address (for example, testing80@yahoo.com)

Password: Your Yahoo! Mail password



Troubleshooting tips



If you still can’t send Yahoo! Mail from your mail program, you may be accessing the Internet through an ISP that is blocking the SMTP port. If this is the case, try setting the SMTP port number to 587 when sending email via Yahoo!'s SMTP server.



Your email program gives you the option of either deleting your Yahoo! messages from the Yahoo! server after downloading them into your mail reader, or leaving them on the Yahoo! server so you can see them online in your Yahoo! account, too.