How to allow form submission on CustomPages?

class CreateGroupSettings extends Page
{
    protected static ?string $navigationIcon = 'heroicon-o-document-text';
    protected static string $view = 'filament.pages.create-group-settings';
    public static bool $shouldRegisterNavigation = false;
    protected static ?string $slug = 'group-settings/create';

    public $sectionId;
    ( some code )

    public function mount(): void
    {
       (some code)
    }
}