How to write a private message?

On the forum? There’s a small envelope icon that takes you to your PMs. 

There's an envelope icon between the magnifying glass icon and bell icon

I know. But I can't write the PMs. I can only read what is sent to me.

Have you checked your options?

Does it say 'You've reached the maximum amount of posts you can send' when you try to write a PM?

On the inbox page, I've got a "create new message" icon next to the settings icon. 

There is only button "report"

Have you tried clicking these buttons?

But I hasn't got second button

Take a screenshot of it

We need physical evidence of the issue