How to implement the class and my metrics?

[ayrtonyagami]

Hello everyone, this is the first time I come into contact with this tool. And I'm using it to measure a winform application. With the help of the documentation I have already been able to put Metrins.Net running normally, but I also want to put my own metrics and I do not know where to implement or create the class with the metrics.
The initial setting:
Metric.Config.WithHttpEndpoint ("http: // localhost: 1234 /") .WithAllCounters ();
I put it in the Program class.

I know this is very basic, but only you can help me.