About button which is hard to implement

Hello everyone. I have a question about a button that I cannot implement in noteViewController not in storyboard nor in the swift file programmatically. In the noteViewController in storyboard I picked up the bar button but it is not shown when I click + button and in the simulator displays the noteViewController. How to fix this?
Codes are shown below and the photo.

noteViewController:

import UIKit

class noteViewController: UIViewController {

@IBOutlet var Titel: UITextField!
@IBOutlet var texts: UITextView!

public var completion: ((String, String) -> Void)!

override func viewDidLoad() {
    super.viewDidLoad()
    Titel.becomeFirstResponder()
    //how to set a suitable button for saving on storyboard or in the file?
    
}


@IBAction func saveButton(_ sender: Any) {
    
}

}

ViewController:

import UIKit

class ViewController: UIViewController {

@IBOutlet var tableView: UITableView!

var models: [(String, String)] = []

override func viewDidLoad() {
    super.viewDidLoad()
    tableView.delegate = self
    tableView.dataSource = self
}

@IBAction func addButton(_ sender: Any) {
    let vc = storyboard?.instantiateViewController(identifier: "note") as! noteViewController
    vc.modalPresentationStyle = .fullScreen
    present(vc, animated: true)
    
}

}

extension ViewController: UITableViewDelegate, UITableViewDataSource {

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return models.count
}
//how to set in func below?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
    return cell
}

}

I suggest doing a segue instead so its a more direct transition