GL-B1300 use of DynDNS via DDNS

Hi, I have tried to use DynDNS (I have modified /etc/config/ddns and had put in two new sections for DynDNS below Gl-ddns section and have activated DDNS Service (of course restarted the DDNS service) but DDNS Service is not updating my IPs at DynDNS… What I am doing wrong?

Thx
SOMCON

Can you show your ddns config file?