trying to do 2-star no skips

how do i get my timer to show when i play the game in full screen mode

i am new to speedrun.com and i want to record on xbox do i use mixer or twitch and i want to add a timer as well but i don't know how to do it.

Do i have to link my xbox to the speedrun.com or my mixer or my twitch account

and want about xbox 360