Senate Page Program?

Hello! I’m a junior this year and I just started looking to the US Senate Page Program. I was thinking of applying, but I had a couple of questions that i’ve been struggling to find the answesrs for. Like, do you get to choose which session you apply for, or do they assign it to you. Also, as far as applications, is the application reviewed by your senator, and then chosen, or does it go through other people who run the program. ( i don’t know if that question makes sense).