Hi nearly Spanish Unicorn,
"Been trying to put VPN on laptop but without success."...........to get help on this you would need to give more details of the problem..........
Back to SmartyDNS
Have you put the SmartyDNS settings in the laptop Network configuration and Validated from your account ?
Don't assume the SmartyNS settings are in the Router........CHECK !!

UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity.