New to the site not sure if I'm able to upload straight from USB?

Hey Crimson! Welcome to the site. I’d recommend uploading your run to a video sharing website. Most clips are submitted via YouTube or Twitch (if it was livestreamed). So just upload your clip to YouTube and once you’ve done that just come back to speedrun.com and submit the link to your video :) best of luck!

Ok cool thanks for the info :)