To get the QR codes for the students you first need to get to their webdesk. https://launchpad.classlink.com/home

Or webdesk.pisd.edu will redirect there

On the top right corner there are a number of options that look like . 

Click the profile of the person and then  my profile.

Then from the drop down on the left click sign-in options. .

From there Click the connect button beside the quickcard .

Then click the print button that appears. It'll give you a page with the qr code on it. 

If you print that it'll just be one QR code per page, to save paper right click and copy it to a blank page on a word document.