@Bri That is not the best solution. I found some forums offer the users to select between several editors including markdown, that is what I want to have.

The most weakest point of nodebb

Nodebb is great, the editor Markdown is also a plus. I deployed the forum with nodebb, but most of the users complain that the editor is a mess they refuse to learn anything about MarkDown. Then I switched to another forum software.

So I have a suggestion for the NodeBB develop team:
Markdown is great, but most lazy people just want to use some stupid easier editors such as WYSIWYG. So it is better to add the features to let the forum users have the choice to select which editor they like. Those Markdown fan can choose to use MarkDown, while the others can choose the traditional simple editors as they like.

Without such feature, lots of people will turn to use other forum softwares, that would be a loss for nodebb.