how to apply lpn?

I'm not sure exactly what you are asking, but from what I can deduce, I think it would depend on the particular program. Some programs might have an application that is interchangeable for LPN or RN program; others might have different required entrance tests. I know, for example, that the NET seems to be more commong for LPN entrance, while the PSB or TEAS is often used for RN program admission.

The best thing to do is to contact the school to which you are applying; I'm sure they can answer your question more specifically.