Thanks everyone for the help! I got it working and already did a run. I don't have proof of the run so I can't submit it, but now that I got livesplit working, I will be able to submit runs.

So I did what you guys said, but when I press my hotkey to start the timer, it lights up green but doesn't start counting. I can still make splits and remove them, but because the timer is at zero, all of the times would be zero. How do I fix that?

I'm new to speedrunning, can someone help me figure out what this means and how to fix it?

Rejected: Your split show your RTA, I can't see your IGT to check it, next time turn your livesplit to "gametime" or upload your demo