how do I get into the nursing program

Well this might be the Captain Obvious answer but start with researching available programs and apply.  Be prepared to possibly retake the prerequisites since they are three years old, especially if applying to different schools than where you took those classes. 

Where are you located? How many programs are in your area? Where have you applied?

Some programs are much more competitive than others you may need to drive a bit to get to them. *Sometimes* associates programs can be easier to get into and the doing a BSN program online isn't too bad to get into. 

As mentioned, you may need to retake some courses, since some schools have time limits on how long ago students can complete certain prerequisites. Additionally, schools may give preference to applicants who already hold a degree, so it really depends on where you are applying. Your best approach is to apply to multiple programs and evaluate your options from there. Ultimately, it's about finding the right fit for you.