looks like it can't be done
Thank you for choosing NETGEAR. My name is Shyney and I will be your support engineer.
I understand that you want to reboot the router using software.
I regret to inform that there is no option to reboot the router using the browser.
Thanks again for choosing NETGEAR. Have a great day!
Sincerely,
Shyney
NETGEAR, Inc.
http://my.netgear.com