@user250478 As you surely noticed, only very few users visit this room. (At the moments, only you and me are pingable here.)

Maybe you could try MathJax chatroom or Mathematics chatroom?

Of course, I am not sure how likely it is that you'll find somebody who has experience with wordpress and MathJax.

Personally, I do not have any experience with WordPress. Of course, you can find something about this online.

For example, this is on one of well-known Math blogs: MathJax in WordPress and LaTeX for Math Blogs

There is a site WordPress Development - but I am not sure whether questions about MathJax are on-topic there. (But I can see this question: Math notation on WordPress.com?)

That site has a chatroom too - but it seems rather inactive.

Maybe you can have a look at questions on SE about this topic.

Or you can start by questions tagged both wordpress and mathjax to see whether some of those questions helps.

Many thanks for your reply professor @MartinSleziak , when I can I read this information. It is a great compilation of useful information that you did (in this chat and in Meta of some Stack Exchange site)! Many thanks again.