If you mean "how do I give chemotherapy", you will take a class at your institution. Mine breaks it up to basic and advanced. If you mean how do you get OCN after your name, you have to take a test, which costs, I believe, around $200-250.
I work oncology now, and am advanced chemo certified at my institution, but I am not an OCN, which is a credential given through the Oncology Nursing Society. The ability to give chemo has nothing to do with OCN. If I left my hospital and went somewhere else, I would have to take their chemo classes in order to be able to give chemo there, regardless of the fact that I have been giving chemo for several years. Even if I was an OCN, I would still have to take the other institutions classes. You have to have so many hours of oncolgy experience (might be 2000, but I could be way off on that!) in order to take the test, and they have CE requirements that you must meet to renew your OCN. There are classes that you can take before you take the test. Go to
www.ons.org for more information. Look to see if there is a local chapter near you. I don't think you have to be an OCN to be a member of ONS, but I'm not sure. Hope this helps!!!