So I do not have a computer is there a way to use splits or sosmthing I can use?

You could use a thing in a phone browser called Splitty. http://ylorant.github.io/splitty/

After the run, how do you link it to the video?

That i do not know

You shouldn't need a timer on screen for the run to be valid. The length of the video itself serves as a good enough time to validate your run.

Also, when mods verify runs we also tend to time it ourselves just in case, so don't worry, timer on screen isn't needed.

Ah,ok Thanks for everyone how helped.