Match passes are on sale from this page: https://www.qpr.co.uk/qprpluspass/
Please note, you will NOT receive a voucher when you buy a match pass. The match pass will automatically link to the QPR Account that you purchase it on, so please make a note of the email address that you use to login.
After buying your match pass, you can watch on the QPR App, or this page on the website: https://www.qpr.co.uk/videos/live/live-matches/