How do i highlight or delete a speedrun if i submitted 2 runs by accident?

Is it allowed to use the autoaim gta has for xbox 360? If not, then idk how to remove it either

Hey guys. I play on Xbox 360 and i have my computer besides me for livesplit. How can i start the timer and stop it at the EXACT frame? Also if i stream my run, does it have to be screen recorded? Or can i just stream from my computer or something? Last thing, does my timer have to be shown in the stream? Kind regards Silas.