I wish to know what are the things to be followed to join digitalpoint forum, why do we get this message (Your user account may not have sufficient privileges to access this page) and what should be done to make the first posting
It depends upon what you were trying to do. But it looks like you didn't go through rules well. Check them out - http://forums.digitalpoint.com/faq.php?faq=rules#faq_posting_guidelines
The only thing I can think of is maybe you didn't have permissions to do whatever you were trying to do.