I am on a Chromebook and I cannot use any of the timers in the resources. Also, I want to upload a new game. I also have a question. Do I have to have a timer? They can just look at my video length.

Most leaderboards do not require an on-screen timer, but make sure to check the rules.

You can request a new game here:

https://www.speedrun.com/requestgame

Make sure to read all the requirements first.