How to add post process with URP package

hey !
For my project, i add the URP package and then, wanted to add post process package…but it dont work…
did i miss something ?

Go to the package manager, then next to the search bar in the top right, press advanced, and press show preview packages. Then make sure in the top left that it says ‘Unity Packages’ if not change it. If it does, In the search bar type in ‘Post’ and it should pop up.

nice ! i can add the post process package but now i have a new problem ><
My global volume just dont work… i can add a profile but this dont change anything…

any idea ?

thanks ^^