change email address in webconfig

hi 

i use these code in webconfig to sending email to my gmail

<configuration>
	<appSettings>
		<add key="Host" value="smtp.gmail.com"/>
		<add key="EnableSsl" value="true"/>
		<add key="UserName" value="neda@gmail.com"/>
		<add key="Password" value="xxxxxxxxxxx"/>
		<add key="Port" value="587"/>
	</appSettings>
	<connectionStrings/>

now i want when users click on button it send email to my other email address i.e

support@behtob.com

now how i should change above code?