The activation process is bit of complicated at this moment, so please follow the steps,
http://www.lextm.com/index.php/2013/05/snmp-pro-private-beta-is-ready-and-early-access-program-starts/
Will make it easier in future releases.
http://www.lextm.com/index.php/2013/05/snmp-pro-private-beta-is-ready-and-early-access-program-starts/
Will make it easier in future releases.