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how do i change my default e-mail from copper.net to yahoo.com. i cannot send my e-mails from yahoo.com

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i am trying to send e-mails from a yahoo.com account, however my computer is trying to use the old account @ copper.net. what do I do???

i am trying to send e-mails from a yahoo.com account, however my computer is trying to use the old account @ copper.net. what do I do???

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If you are talking about mailto hyperlinks on web pages when using Firefox, see this support article.
http://support.mozilla.com/en-US/kb/Changing+the+e-mail+program+used+by+Firefox

If your problem is with Mozilla Thunderbird, see this forum for support. http://www.mozillamessaging.com/en-US/support/
or this one
http://forums.mozillazine.org/viewforum.php?f=39

If you are talking about a different email program on your PC, seek support from the appropriate forum or support pages for that particular program.