Add the new address to your Account, verify it and make it the Primary. If you are using the online button creator to generate "hosted" item button code, the email notifications will now come to the new address.
If you are manually creating your item button code, then you don't have to make the new email address the Primary. All you need to do is change the "business" variable value in your item button code to the new email address. The line of code you would change will look something like this example:
<input type="hidden" name="business" value="youremail@youremail.com">
Regards,
skier
