I have already chosen the wrong outgoing mail server? What do I need to do to change to the right server?

Yahoo: For the incoming mail server I chose Pop3, but for the out going I believe I chose the same Pop 3 and it looks like it shoud be SMTP, how can I change this, I am unable to send emails on my Yahoo account because of this mistake. Can someone be very specific as to what I need to do. Thanks. I have already chosen the wrong outgoing mail server? What do I need to do to change to the right server?
yahoo mail servers address (for yahoo.com address)

* Incoming Mail Server (POP3): plus.pop.mail.yahoo.com

Use SSL, port: 995

* Outgoing Mail Server (SMTP): plus.smtp.mail.yahoo.com

Use SSL, port: 465, use authentication

Click this link for yahoo mail pop3 settings

http://help.yahoo.com/l/us/yahoo/mail/ya

http://help.yahoo.com/l/us/yahoo/mail/cl



For yahoo mail servers address (for yahoo.co.uk address)

* Incoming mail server (POP3): pop.mail.yahoo.co.uk

* Outgoing mail server (SMTP): smpt.mail.yahoo.co.uk

Click this link for yahoo mail pop3 settings

http://help.yahoo.com/l/uk/yahoo/mail/cl