Space Ship gameobject's Capsule Collider will not collide with walltrigger's Box Collider, please help

Ok so right now I am currently learning how to use Unity through Sams Teach Yourself Unity Game Development in 24 Hours. I just finished chapter 15, "Hour 15: Game 3: Captain Blaster." Right now I'm working on the end of chapter exercises to polish up the game and I'm completely stuck. This game is a 2D sapce shooter where you move along the bottom of the screen on the x-axis only. Around the camera view and scrolling background are walls called triggers that detect collision for the meteors to destroy the ones that make it off-screen. I want the ones on the left and right to stop my spaceship from moving out of bounds, but the problem is that when I try to collide with the triggers the spaceship just goes right through them. I'll provide pictures of my settings and scripts for both the triggers and spaceship.

 using UnityEngine;
 using System.Collections;
 
 public class TriggerScript : MonoBehaviour {
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
    
     void OnTriggerEnter(Collider other)
     {
         if(other.tag == tag)
         {
             print("PLAYER");
             //Destroy(other.gameObject);
         }
         else
         {
             print("METEOR");
         }
        
     }
 }


 using UnityEngine;
 using System.Collections;
 
 public class PlayerScript : MonoBehaviour {
 
 
     //player speed
     public float speed = 10f;
 
     //bullet prefab
     public GameObject bullet;
 
     //control script
     public GameControlScript control;
 
     //player can fire a bullet every half second
     public float bulletThreshold = 0.5f;
     float elapsedTime = 0;
 
 
 
     // Use this for initialization
     void Start () {}
     
     // Update is called once per frame
     void Update () {
         //keeping track of time for bullet firing
         elapsedTime += Time.deltaTime;
 
         //move the player sideways
         //if (transform.position.x < 7 && transform.position.x > -7)
         //{
             transform.Translate(Input.GetAxis("Horizontal") * speed * Time.deltaTime,
                 0f, 0f);
        // }
         
 
         //spacebar fires.  The current setup calls this "Jump"
         //this was left to avoid confusion
         if (Input.GetButtonDown("Jump"))
         {
             //see if enough time has passed to fire a new bullet
             if (elapsedTime > bulletThreshold)
             {
                 //fire bullet at current position
                 //be sure the bullet is created in front of the player
                 //so they don't collide
                 Instantiate(bullet, new Vector3(transform.position.x+0.2f, transform.position.y + 1.2f,
                     -5f), Quaternion.identity);
                 Instantiate(bullet, new Vector3(transform.position.x-0.2f, transform.position.y + 1.2f,
                     -5f), Quaternion.identity);
 
                 //reset bullet firing timer
                 elapsedTime = 0f;
             }
         }
     }
 
     //if a meteor hits the player
     void OnTriggerEnter(Collider other)
     {
         if (other.tag != tag)
         {
             Destroy(other.gameObject);
             control.PlayerDied();
             Destroy(this.gameObject);
         }
     }
 
 
 }