Finding own preceptor

[Yuppers21]

Hi all! I've done a quick search and it didn't yield the results I am looking for so I thought I would post here. I am in my 3rd semester and will be doing my capstone in next spring. While my school does have a system for assigning preceptors, I've been told by an instructor that I can find my own if I choose. If I were to contact a hospital (or even specific floor/unit) who would I want to get a hold of? The nurse manager? Or possibly someone in HR? Has anyone done this for their RN? I found several posts for students in nurse practitioner programs, but not specifically RN. Any help is appreciated!