If you wish to learn PNR posting, Please go to PNR forum,
Click it ,
go to write ten digit PNR no.
click 'PNR prediction/analysis' button.
and you get a text box where prewritten text...
more... is available. if you want to add something more please write. and click 'post blog' button.
This completes the formality and your PNR prediciton has started. you observe its progress till your journey day.