4nec2 optimizer

Hello,everyone.
How to optimize VSWR of a broad band antenna using 4NEC2?
And how to set the optimized algorithm "genetic algorithm" in 4NEC2?
Can you give me some examples to use 4nec2 with optimizer.
Thanks a lot!

you've got to use the notepad editor, instead of graphic editor, then set the optimization variables (like the distance beetween dipoles in a yagi uda) as parameters, and launch the optmization, for a certain target (such as the vswr) using those parameters. I guess there should be some example in the manual given with the software

To:Vaga_BOnd,
Thank you for your reply.
Now I can use GA method in 4NEC2 to simulate simple examples.
But all the parameters of GA (such as select,cross,mute and other parameter) I choose default setup.Thus this may limit my furthur improvement to GA method.In order to grasp GA optimal method in 4NEC2,can you give some suggestions or some examples?