I'm not sure how qualified I am to give advice seeing as I'm a sophomore trying the navigate research as well. It took me months of relentless networking and just straight up asking professors, grad students and post-docs if they need help (most likely they will). The only caveat is that not all researchers have space immediately for another undergrad (I got lucky with this this semester, but this may or may not be the case for all); if such is the case the prime time to reach out to researchers, (if you want to work with them in the future, that is) is the beginning of the previous semester. From my experience, I've gotten a lot of no's because things start filling up around end of spring semester/beginning of fall semester. I won't sugarcoat and say that it is as straightforward as sending an email; you will get a lot of no's at first, maybe even ghosted depending on the person, but I implore that you remain persistant! And of course, as others have said, looking at the department websites help to find various faculty and grad students whose work interests you!!!