My most recent run was during my livestream on youtube, versus my last on twitch. Twitch allowed me to make a high light video where i could select the part of the stream I wanted highlighted. Will I need to download my video and reupload just the section where my run is. Or can I put a URL that will open the video to where the run starts?

There are two different games I don't see. One I have done runs in. The other I am going to start soon. I am new to using the site, even though I have had an account. How would I get the game added, and submit my times?