When You adding a new element to the list, how made in adding item drop down list, where can users choise person which adding this thing to the list. I want to person have got a chance to choise person from the dropdownlist. I want dropdownlist at adding form. With name of users, and in order that name schould be.
You can narrow down the People field by assigning it a SharePoint Group...
See below image:
Here you can provide your SharePoint Group to select people from!