Where we can add Access token URl,Client Id and Client Secret in crm 365.

Hi guys,

I want [Authorize] the user who could be hit my external  web api from crm 2016.

Question:-

1 . where we can put all the secret ids like:- Access token URl,Client Id and Client Secret .

2.  How get Access token through java script.

Note:- I using external web Api.  My Keys:- 

Auth URL :- xyz.azurewebsites.net/identity

Access token URl :- xyz.azurewebsites.net/.../token

Client Id:- abc

Client Secret :- xyz-abc-frt