How do I add button to wordpress navbar walker menu?

Question

I have created the theme and used the navbar walker menu in developing the dynamic menu and it's working well. Now, my question is, how do I add the button Login and signup to the navbar walker menu that is within the navbar loop not outside as I have done.

navbar walker menu Resources Navbar

<header id="header" class="fixed-top">
    <div class="d-flex align-items-center justify-content-between">

      <h1 class="logo"><a href="/"><?php if ( function_exists( 'the_custom_logo' ) ) { the_custom_logo();
}  ?></a></h1>
      <!-- Uncomment below if you prefer to use an image logo -->
      <!-- <a href="index.html" class="logo"><img src="assets/img/logo.png" alt="" class="img-fluid"></a>-->

      <nav id="navbar" class="container navbar">
          <?php
            wp_nav_menu( array(
                'theme_location'  => 'Main',
                'depth'           => 2, // 1 = no dropdowns, 2 = with dropdowns.
        
                
                'fallback_cb'     => 'WP_Bootstrap_Navwalker::fallback',
                'walker'          => new WP_Bootstrap_Navwalker(),
            ) );


            ?>
        <a class="nav-link  signin btn-outline-primary scrollto" href="#about">Login</a>
            <a class="nav-link btn   getstarted scrollto" href="#about">Sign Up</a>
        <i class="bi bi-list mobile-nav-toggle"></i>
      </nav><!-- .navbar -->

    </div>
  </header><!-- End Header -->