Silverstripe 5.4 color picker in tinymce how to

Silverstripe 5.4:

How to add color picker in Tinymce in admin section.

hi guys i am having problems with tinymce in silverstripe 5.4 i have added yml file and _config.php file both i have no results, can you give me a hint?

yaml file i created:

SilverStripe\Forms\HTMLEditor\TinyMCEConfig:
  editor:
    plugins:
      - link
      - table
      - lists
      - code
      - fullscreen
      - textcolor
    toolbar1: 'formatselect | bold italic underline | forecolor backcolor | alignleft aligncenter alignright | bullist numlist | link table | code fullscreen'

_config.php i have tried:
<?php

use SilverStripe\Forms\HTMLEditor\TinyMCEConfig;
use SilverStripe\Forms\HTMLEditor\HtmlEditorConfig;

TinyMCEConfig::get('cms')
    ->enablePlugins('textcolor')
    ->insertButtonsBefore('formatselect', 'forecolor backcolor');

HtmlEditorConfig::get('cms')->enablePlugins('textcolor');
HtmlEditorConfig::get('cms')->insertButtonsBefore('formatselect', 'forecolor');
    

i will be very happy if someone help me with this, thanks.

fixed, i put _config.php in wrong folder