yea brother, its easy, first of all u have to select the section, following are the sections being used in PDF;
Members Introduction (1 Viewing)
Military Aviation (30 Viewing)
Land Forces (17 Viewing)
Naval Forces (10 Viewing)
WMD & Missiles (5 Viewing)
Military History (6 Viewing)
General Defence (11 Viewing)
Weapons Club (9 Viewing)
The Military Defence
Military Photos & Multimedia (24 Viewing)
Pakistan Affairs
Pakistan's War (39 Viewing)
Strategic & Geopolitical Issues (20 Viewing)
National Political Issues (15 Viewing)
Current Events & Social Issues (18 Viewing)
World Affairs (20 Viewing)
Military Forum (18 Viewing)
U.S. Foreign Affairs (2 Viewing)
Bangladesh Defence (3 Viewing)
India Defence (54 Viewing)
China Defence (11 Viewing)
Members Club (19 Viewing)
Economy & Development (20 Viewing)
General Images & Multimedia (57 Viewing)
choose the section and click on it, a list of threads already started in that section would appear, now scroll down to the end of the list, there u'd see a button "New Thread" click on it, then a couple of text boxes will appear, first for the title of the thread and the other for the introductory note by you, mentioning the purpose of starting the thread, when u r done writing, click on the "Submit New Thread" button and ur thread will appear in the section which u selected earlier.
Thats how its done brother, hope it helps u creating your own thread, BEST OF LUCK...