I dont know how to turn a video into a link and idk what recorder to use im on mobile btw pls help!

You turn a video into a link by uploading it to a shareable video hosting site. YouTube and Twitch are the most popular on Speedrun.com.

If you’re on iOS, you could use the built-in screen recorder.

When you've uploaded the video (it can even be via iCloud sharing or twitter to be honest although more tricky) you'll generally paste the URL into the video link field.