how use the Private Messages is PCbanter.

Please explain for me what how is send Private Messages for users Pcbanter.
For Example:
then move poniter on the title user open the menu what two section:
1- Name user
2- View message headers
then click on the "View message headers" open the new windows with this message:
Newsgroup message headers contain the email address of the poster. To combat
automated email harvesting (and the subsequent spam), please enter the image
verification text below which demonstrates you are not a machine:

Now , How is it ....