To use the Deadlock Timer, navigate to the Deadlock Timer page in the upper right corner of your screen. Share either your full screen or the specific game window you’re playing on.
Next click and drag on the red box as shown in the image above and place over the timer above it.
It should look like the image above if you did it correctly.
The picture above is the current interface, you can see the timer counting as well as having different languages to use and a volume slider.