Hi! I would like to know how can I post an email for having a chat in the forum. I don’t know how can I have at least 5posts which you siad in your site.
Hello Maedeh,
You have made your first post on the forum. 
Only four to go.
There is no point in being able to send private messages until you have made contact on the public forums with some people with whom you want to have a discussion, so just be a little patient.
I suggest you go to the home page at
english-test.net/forum/
and look for some topics you are interested in for a while first.