Hello, my question is, when you already streamed your run on youtube and I guess you send the site the link in the option of submiting a run... well thats not the point, I started the timer a bit earlier before strating the real run because I don´t know how to start both in the exact same time so, when I send the link, will the site see when I began and will calculate the time or do I have to do that on my own?

Normally, the mods in charge of the game's leaderboard should re-time the run if you didn't start the timer (or end it even) at the correct time. The site itself isn't gonna be doing anything, the ones who does stuff (as in, verify runs, times on submitted speedruns and other stuff) are leaderboards moderators.

If the timer isn't on the video you submitted it might be a problem though. moderators can time the run but it would be nice if the timer was showing on the video.

If you're running a console game starting the timer and the run at the same time is easy - just hit your split key and whatever button on your controller you need to hit in order to start the run.

For PC games, you'll want to enable global hotkeys for your timer. This will allow key presses to work in the timer program even if the program isn't the program you're currently clicked on. This way it can run in the background and you can press two keys - one to start the timer and one to start the PC game.

Same goes for splitting, global hotkeys will allow you to split without being clicked on the timer.