As you have asked about the steps to know about the admit card or roll no. of the Haryana Board of Secondary Education (HBSE), I am giving you information about it, check below for the details

School institutions can download the exam admit card/ roll no. slip of their students online.
Private Students/ Re-appear students will have to used their old Roll No. with their registration no. for downloading of their new admit card.
Exam Authorities said that Roll No’s to any School Heads/ Students/ Institutions will not be sent by post.
Prior to this the Roll no. of Board Classes collected from the DEO offices of concerned District HQ.
But this is second time when it will be available online.
If the Time Table to be change , then Haryana Board 10th Class Roll No. and 12th Class Roll No. will remain the same.

Steps to download the Admit card/ Roll No

Open the Official website
Then Click on Exam Admit Card Downloading Link.
Fill your School Name in given box (if space given).
Then Fill User ID or Roll No. and Click on Proceed.
Admit Card will contain the information about
Name,
Father’s Name,
School Name,
Exam Centre,
DOB etc.
Printout in Black & White Mode