Some users have set their settings so that they can't accept private messages. Users with fewer than 10 posts can't use the private message facility.
I've moved this to the Support Area in case there is something else going on.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Moreover, my posts are more than 10.
By the way, what is meant by "support area"?
We will look into the issue, but I would ask whether you were sending messages to people who had posted recently.
You have to enter your message in the unlabeled editor below "Title". You have to scroll down to see the editor.
I am not a teacher.
The username does have to be case sensitive to find them.