Just in case you are looking for more detail (i think you havent started med school yet?). Around early July or whenever your fourth year of med school you get a code from your school that allows you to open an application on the Electronic Residency Application Service (ERAS). You start working on your application filling out all the detail of your CV, putting in your work, volunteer, research experience mostly just from med school, but maybe some key stuff prior to med school as well if relevant and if it will add something to the application. Gather together your letters of recommendation. Select the programs you're interested in applying to and save them to a list on the service. Write your personal statement, save that, etc. You can submit your ERAS application to all of programs you selected starting in mid-september. Neurology itself is a pgy-2 (post graduate year, after you graduate from medical school) specialty, meaning that you will have to do a preliminary year in internal medicine first before starting neurology-specific training. I didn't apply to neurology, so i dont know *precisely* how it works, but it seems like some (or all) programs have that preliminary training built in, for a total of four years of residency (one year in internal medicine and three years neurology), and some have it where you only apply there as a separate program after looking elsewhere for your preliminary year. No matter what, it seems like for all you still have to apply to both the neurology program itself as well as a prelim year, so you would have to apply to both types of programs, interview for both types of programs, and match into both types to achieve a successful neurology match. Maybe the details of that are a bit off but that is the basic gist and what i can say to you as a fourth year!
Good luck!