How can I make my character walk up hills.

I followed a tutorial for a character controller. The tutorial however does not allow the character to walk up hills and when it jumps onto a hill it gets stuck. Here is the code i got from the tutorial.

using UnityEngine; using System.Collections;

 public class CharacterController : MonoBehaviour {
 
     [System.Serializable]
     public class MoveSettings
     {
         public float rotateVel = 100;
         public float forwardVel = 12;
         public float jumpVel = 25;
         public float distToGrounded = 0.1f;
         public LayerMask ground;
     }
 
     [System.Serializable]
     public class PhysSettings
     {
         public float downAccel = 0.75f;
     }
 
     [System.Serializable]
     public class InputSettings
     {
         public float inputDelay = 0.1f;
         public string FORWARD_AXIS = "Vertical";
         public string TURN_AXIS = "Horizontal";
         public string JUMP_AXIS = "Jump";
     }
 
     public MoveSettings moveSetting = new MoveSettings ();
     public PhysSettings physSetting = new PhysSettings ();
     public InputSettings inputSetting = new InputSettings ();
 
     Vector3 velocity = Vector3.zero;
     Quaternion targetRotation;
     Rigidbody rBody;
     float forwardInput, turnInput, jumpInput;
 
     public Quaternion TargetRotation 
     {
         get { return targetRotation; }
     }
 
     bool Grounded()
     {
         return Physics.Raycast (transform.position, Vector3.down, moveSetting.distToGrounded, moveSetting.ground);
     }
 
     void Start()
     {
         targetRotation = transform.rotation;
         if (GetComponent<Rigidbody> ())
             rBody = GetComponent<Rigidbody> ();
         else
             Debug.LogError ("The Character needs a rigidbody");
 
         forwardInput = turnInput = jumpInput = 0;
     }
 
     void GetInput()
     {
         forwardInput = Input.GetAxis (inputSetting.FORWARD_AXIS);
         turnInput = Input.GetAxis (inputSetting.TURN_AXIS);
         jumpInput = Input.GetAxisRaw (inputSetting.JUMP_AXIS);
     }
 
     void Update()
     {
         GetInput ();
         Turn ();
     }
 
     void FixedUpdate()
     {
         Run ();
         Jump ();
 
         rBody.velocity = transform.TransformDirection(velocity);
     }
 
     void Run()
     {
         if (Mathf.Abs (forwardInput) > inputSetting.inputDelay) 
         {
             //move
             velocity.z = moveSetting.forwardVel * forwardInput;
         }
         else
             //zero velocity
             velocity.z = 0;
     }
 
     void Turn()
     {
         if (Mathf.Abs (turnInput) > inputSetting.inputDelay) 
         {
             targetRotation *= Quaternion.AngleAxis (moveSetting.rotateVel * turnInput * Time.deltaTime, Vector3.up);
         }
         transform.rotation = targetRotation;
     }
 
     void Jump()
     {
         if (jumpInput > 0 && Grounded ()) 
         {
             //jump
             velocity.y = moveSetting.jumpVel;
         } 
         else if (jumpInput == 0 && Grounded ()) 
         {
             //zero out velocity.y
             velocity.y = 0;
         } 
         else 
         {
             //decrease velocity.y
             velocity.y -= physSetting.downAccel;
         }
     }
 }