FBR has left a lakuna to 'Support' the people at respective RTO offices, to make money.
visit your concerned RTO office goto the help desk and you will be referred to IT section operator who can update the data against SOME fee.
make sure you compile every data you want to change and print it in double space on paper so to avoid data entry operator error. Once he complete the task request him to give you a draft print out before submission double check, request him to submit, Pay him agreed feed, after you have submitted correct print out which has print date & time of submission at bottom.
approx 500 - 1000 is fee for update of data. at RTO Offices.