How exactly do you install spigot to your 1.8.9 server

So for the past day i tried to create a spigot server.
I started by downloading the build tool spigot profile and then downloading the 1.8.9 spigot version however when i set the profile to build tool latest and the runnable jar to build tool latest i’m not able to start the server.
i also tried creating the build tool with git but i didnt know how to do it any further.
it would be really nice if someone could tell me how exactly do install spigot on your 1.8.9 server?
thanks in advance.

I posted something that helped another,

Thanks, but i cant set the jat profile to spigot