What does Leviticus 16:15 mean?

Next, he kills the goat that’s for the people’s sin, brings its blood behind the curtain, and does the same thing with it—sprinkling it on and in front of the lid. Leviticus 16:15 - Modern Text Bible

(The goat’s blood is used just like the bull’s, but this time it’s for the whole community, not just the priest.)