HOW TO CHANGE THE MESSAGE for awaiting confirmation EMAIL

[PAKIDIL]

hello ,

i want to ask when we set the awaiting confirmation email .A user registered his NICK NAME after completing registration a message appears:
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Thank you for registering, azzz. An email has been dispatched to ABC@hotmail.com with details on how to activate your account. Click here to return to where you were previously.

You will receive an email in your inbox. You MUST follow the link in that email before you can post on these forums. Until you do that, you will be told that you do not have permission to post

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Now i want to change this message how can i ? becoz my confirmation mails goes to hotmail/yahoo junk box and i want to tell the member here to Check Their HOTMAIL OR YAHO JUNK BOX for confirmation email

thanks
waiting for ur replies