hingeJoint.anchor = Vector3 (2, 0, 0);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        hingeJoint.anchor = new Vector3(2, 0, 0);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        hingeJoint.anchor = Vector3(2, 0, 0)