I also can't seem to figure this out. Anybody have a step by step?

Here is what I've done:

No firewall
Installed vnc server via Synaptic on PCLINUXOS laptop connected via wifi to net.
Turned on server as service
Went to DyamicDNS and set up acct
Installed vnc viewer
Tried to connect using both DynamicDNS and ip,all I get is uable to connect mssage which is unhelpfull - no idea why.