Each airport runs courses....At ours it's through the Safety and Compliance team.
If you require a licence you will be told how to apply. If you do not work at an airport you will not be able to take a course as far as I know.
Name the airport you are at and someone may be able to give a more specific answer..
Or did you mean you wanted to know how to carry out the training??? Again, your airport should be able to give you details.