and register in 3322.org as follows:
User name tenda
Password 123456
Domain Name tenda.vicp.net
After mapping the port  in the virtual server, setting 
account   information   in   DDNS   server   and   in   the 
address field entering http://tenda.3322.org, you can 
access the Web page.
15.3 Backup/Restore Settings
The device provides backup/restore settings, so you 
need set a directory to keep these parameters.
 Backup Setting:
Click   “Backup”   button   to   back   up   the   Router’s 
settings and select the path for save.