Sorry about my poor English

I achieved a Genocide Route Speedrun, but I don't know how to upload the video

When I want to submit a record, I only see it requesting me to provide a video link

Should I upload the video to a certain platform and fill in the webpage link in the form? If so, do I have to upload a Speedrun video on YouTube? I don't have a YouTube account,it's difficult for Chinese people to use English websites

Yes, you would need to upload the video somewhere else as speedrun.com doesn't host videos. We've had people submit runs using bilibili, if you're able to upload there.