Do you have a smart TV? if yes then you can normally download Sooner's app on your TV, with your app on the mobile you can easily log in and that way you can stream a movie on Sooner (LG & Fire TV and Samsung are not supported).
If you have a regular TV then you can use Sooner's app on your cell phone to cast to your TV if it shares the same wifi.
You can also connect an HDMI cable from your laptop to your TV and play a movie on your TV.
You can also cast to your TV via your laptop via the website (then you have to start a movie and then click to the top right on the 3 dots below and then choose Cast).