Text box with text formatting bar

If you mean adding a basic formatting editor to the front-end listing description field please try this code snippet https://gist.github.com/hivepress/4ed3d319ab220c6e005f58a4da95e504

That’s right, where should I add that code snippet, what is the path?

We encountered an error activating your snippet, please check the syntax and try again.

If you used the Code Snippets plugin please make sure that you didn’t copy the first line because the Code Snippets plugin already pre-adds it.