When I Set-up My Timer, For.. Say Speed Run 4 On Roblox, I Press The Designated Key To Start It And It Starts, When I Try Do Another Run, It Glitches And Doesn't Start So When I Change The Key To Start It, It Starts Then Doesn't Work Then I Have To Change The Key And....

Another Is Can I Make It Start Automatically?

And How Do I Make Categories That Start When I Do Something In-Game? Take Celeste For Example, When Someone Does The Elevator Shaft In The Resort It Switches To Something Else, Adds their PB, Possible Time Save And How Long A Bit In It Takes To Do, When They Lose/ Gain Time it Says: -0.73 +0.73

If You Can Answer All These Questions, Thanks!

Your first question is a little confusing so I'm not sure what's happening. That said, LiveSplit works like this: You start and split through a run, and then you make your final split. Your final run time will be displayed. Press the split key again and click through the popups to return to a blank timer and start again.

For your second and third question, what you're looking for is an autosplitter. These are bits of code that work with LiveSplit and relay game data to LiveSplit so LiveSplit knows what happens when. However, these must be coded on a game-by-game basis, so not many games have an autosplitter. I would ask around on your game''s Discord server or forum to see if someone's made one for your game.

I'm also unsure if you're asking how to just get your splits to display Possible Time Save and time deltas (-0.73) but those are components you can add in the Edit Layout menu.

(By the way, please don't capitalize every word in a sentence, it's not easy on the eyes.)