How can I reset all my e-mail accounts because I changed all server settings and messed with stuff on my System E-mai preferences on my MAC not knowing what I was doing and now none of my accounts will send mail: Gmail, yahoo, or iCloud account, help!

No e-mail account will send what pops up is the message thatI don't have an outgoing e-mail server because the one I want to choose has wrong network key because I took the network key out and don't know where to get the correct one because it was filled in by the system already

Hello, aiszellnut. 
Thank you for visiting Apple Support Communities.
I would need a little more information regarding this issue to better assist you.  However, here is an article that will walk you through some troubleshooting steps that may help with this issue.
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Cheers,
Jason H.

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