you can use the facade class to attach anything to your user resource, in your provider like this
use TomatoPHP\FilamentUsers\Facades\FilamentUser;
public function boot()
{
FilamentUser::registerAction(\Filament\Actions\Action::make('update'));
FilamentUser::registerCreateAction(\Filament\Actions\Action::make('update'));
FilamentUser::registerEditAction(\Filament\Actions\Action::make('update'));
FilamentUser::registerFormInput(\Filament\Forms\Components\TextInput::make('text'));
FilamentUser::registerTableAction(\Filament\Tables\Actions\Action::make('update'));
FilamentUser::registerTableColumn(\Filament\Tables\Columns\Column::make('text'));
FilamentUser::registerTableFilter(\Filament\Tables\Filters\Filter::make('text'));
}