I was recording a run of Gimkit: Don't look down, and I finished the run. I recorded this in OBS Studio and can't need help submitting. It's asking for a video URL. How can I turn one of these clips into a video so I can post the URL? Also, what is and how do I get a Splits.Io URL. I used LiveSplit to time it.

You have to upload the video you recorded with OBS somewhere (e.g. YouTube).

Splits.io is a website where you can upload your splits so they show beside your run here. It's entirely optional.