Dropdown OnpointerClick

Hi guys, i'm still learning about ui.
i'm trying to make a dropdown where the option will be added when you click the dropdown. i'm trying to use Dropdown.OnpointerClick but i still don't know how to use it. here is the sample code that i'm trying to try:

Code (CSharp):

1. public Dropdown dropdown1;
2. public List<string> names;
3.  
4. dropdown1.OnPointerClick(); //i want to use dropdown1.AddOptions(roles) here, but i dont know how to use this

 

Why don't you just tell the answer instead of contributing nothing to the solution.