as adding a tinymce editor icon?

Hello,
I can not speak English well, I hope you understand: (
I love the plugin 😀

I have a problem, I want to add a function
an icon in the editor
Where I can change this?

<img src=”http://micodi.com/image.jpg”&gt;

I want something
<img src=”http://micodi.com/image2.jpg”&gt;

https://ww.wp.xz.cn/plugins/dw-question-answer/