How to create customer or new routes & functions in laravel voyager admin

I want to create my own url to point to a specific function in controller. It says not found.How i can add my own url to voyager admin?

I have new laravel5.8 & voyager1.2 installation. I can create predefined routes but i can not add new route or url.

Below is my view

<a href="" class="btn btn-success btn-add-new"><i class="voyager-plus"></i> <span></span>
</a>

Here is how my routes file

Route::group(['prefix' => 'admin'], function () {
    Voyager::routes();
    Route::get('yourcontroller/order', ['uses' => 'Controller@Yourfunction']);
    Route::get('yourcontroller/select_type', ['uses' => 'Controller@otherfunction']);
    });

The first route yourcontroller/order is working as it is pre-defined while the second route yourcontroller/select_type is not working.

I want to run otherfunction by visiting this url

http://localhost/admin/controller/select_type

via Chebli Mohamed