# Using Camunda with Form.io
To override the CKEDITOR with your own custom plugins and default configurations you will need to clone the ckeditor5 repository, add your own custom code, and then build and put the script into your application. This tutorial will go over the steps on how to achieve this by going through an example of adding the underline tool to the CKEDITOR toolbar.
### Extending the ckeditor repository
In order to create your own custom ckeditor you will need to extend the [**ckeditor5-build-classic**](https://github.com/formio/ckeditor5-build-classic) **repository** with your own custom plugins and imports.
1. Start by downloading the files from [**ckeditor5-build-classic**](https://github.com/formio/ckeditor5-build-classic)
2. Run `yarn install` or `npm install`
3. Install your plugins
4. import the plugin into src/ckeditor.js (In this example we will be importing the underline plugin)
```
import Underline from "@ckeditor/ckeditor5-basic-styles/src/underline";
```
5. In the ClassicEditor.bultinPlugins property add the import(s) to the list
```
ClassicEditor.builtinPlugins = [
Essentials,
UploadAdapter,
Autoformat,
Bold,
Italic,
Underline,
...
```
6. Optional: If you would like all your ckeditors to have the underline tool then you can add 'underline' to ClassicEditor.defaultConfig.toolbar.items
```
ClassicEditor.defaultConfig = {
toolbar: {
items: [
'heading',
'fontFamily',
'fontSize',
'|',
'bold',
'italic',
'link',
'bulletedList',
'numberedList',
'|',
'indent',
'outdent',
'|',
'imageUpload',
'blockQuote',
'insertTable',
'mediaEmbed',
'alignment:left',
'alignment:right',
'alignment:center',
'undo',
'redo',
'underline'
]
},
```
7. Run `yarn build` or `npm run build`
8. You should now see build/ckeditor.js. This will be put into your application in the upcoming next steps
### Adding ckeditor to your application
Now that you have bundled your extended ckeditor, the next thing to do is to put it into your application. This tutorial will create a barebones index.html file as our application and use \