It has two buttons: "Edit Configuration" and "Apply Configuration"
+
+
The "Edit Configuration" button launches an editor on
`~/.config/nixpkgs/overlays/userPackages.nix`, creating it with a
useful template if it doesn't exist. All you have to do is put the
final: prev: {
userPackages = final.buildEnv {
name = "userPackages";
- paths = (with final; [
+ paths = with final; [
firefox
libreoffice