Where do I access my server side .net files?

I am getting the following error

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Server Error in '/' Application.
A from e-mail address must be specified in the From property or the system.net/mailSettings/smtp config section.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: A from e-mail address must be specified in the From property or the system.net/mailSettings/smtp config section.
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Where/How do I access the above file?

Thanks
Chandler

 

Again that worked out perfectly

Thanks Bruce!