add administrate

app/controllers/admin/admin_users_controller.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module Admin
+  class AdminUsersController < Admin::ApplicationController
+    def valid_action?(name, resource = resource_class)
+      ["edit"].exclude?(name.to_s) && super
+    end
+  end
+end

app/controllers/admin/application_controller.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+module Admin
+  class ApplicationController < Administrate::ApplicationController
+    before_action :authenticate_admin_user!
+  end
+end