How to properly implement REST?

Question

RESTful API

Hello! I am making a RESTfull project.
I get the list of users like this:
GET /admin/users
Second page:
GET /admin/users/10
User:
GET /admin/users/name
Next, I need to display a page with a form for adding a user. It is not difficult to guess that users cannot start their nickname with a number.
There were ideas to do this:
GET /admin/users/add
But what to do with a poor user who has chosen the nickname "add"? Make a reservation? Crutch.
Please tell me how to solve this problem for me?

Answer 1

Second page:
GET /admin/users?page=2