My iPhone 4 can't connect to the server?

When I try and send an email I get a message saying can't connect to the server (Yahoo). I try several times and eventually it does work. The message says I need to configure my settings, but I don't know how to. Any ideas?

Apple will support you:

http://www.apple.com/...hone/mail/

Facebook is not open can't connect to sever

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