First you have to open Shunra, click Evaluation. Fill in all the information with junk, doesn't have to be real. Finish that, submit. It tells you blah blah success, enjoy the trial.
Now, whenever Shunra opens again, click Offline License. It now gives you a Host ID, one that is different than before you entered all the junk information. So enter the new Host ID into the keygen, and it should work. Copy/paste the code, and walah, registered.
And all I had to do when I opened the program was select Basic, Create a new WAN project, and put whatever number in the Latency field.
Easy, worked for me.
EDIT: On another note, it is useless for mages. 3000+ MS, they still see/kill me with ease.