How to add country in my nationality field

[Aamir_Durrani]

I have created a customize field nationality, currently i am using selected with options where i added 4 countries, but how i use this list in this field to show all the stored countries.

[NCP]

Use the Link field and select the Option “Country”.

[Aamir_Durrani]

this error showed

[NCP]

You cannot change the field type once created.
Delete the field and again create it.

[Aamir_Durrani]

Yes, I did this, its working. Thank you very much for your kind guidance