Login to Angular ASP.NET CORE app using Postman

I would like to login my app using postman and receive a token when login to make other api call with the token. I have tried {locahost}/connect/token but I get a 405 error. How can I login to my app using postman thank you for your help.

Here is how I generated the app

1. I open visual studio 2019.
2. I chose "Create a new project"
3. Chose ASP.NET Core With Angular
4. Click next
5. Give it a name
6. Save it where you would like
7. In dropDown "Authentication Type" select "Invidual Accounts"

Once the app is created the login and register work perfectly but I want to the these api calls in Postman.

Here is the startup that visual studio generated for me.

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDbContext<erp_colombiaDbContext>(options =>
            options.UseMySql(
                Configuration.GetConnectionString("DefaultConnection")));

        services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = true)
            .AddEntityFrameworkStores<erp_colombiaDbContext>();

        services.AddIdentityServer()
            .AddApiAuthorization<ApplicationUser, erp_colombiaDbContext>();

        services.AddAuthentication()
            .AddIdentityServerJwt();
        services.AddControllersWithViews();
        services.AddRazorPages();
        // In production, the Angular files will be served from this directory
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "ClientApp/dist";
        });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseDatabaseErrorPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        if (!env.IsDevelopment())
        {
            app.UseSpaStaticFiles();
        }

        app.UseRouting();

        app.UseAuthentication();
        app.UseIdentityServer();
        app.UseAuthorization();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllerRoute(
                name: "default",
                pattern: "{controller}/{action=Index}/{id?}");
            endpoints.MapRazorPages();
        });

        app.UseSpa(spa =>
        {
            // To learn more about options for serving an Angular SPA from ASP.NET Core,
            // see https://go.microsoft.com/fwlink/?linkid=864501

            spa.Options.SourcePath = "ClientApp";

            if (env.IsDevelopment())
            {
                spa.UseAngularCliServer(npmScript: "start");
            }
        });
    }
}

I Have seen this answer Default settings for AddApiAuthorization (Scaffolded Angular + IdentityServer4) but I don't understand where he got the values from to fill the postman form "GET NEW ACCESS TOKEN"