User manual:Entering PIN
You can use your Trezor safely with any computer, even one you do not trust. The method for entering PIN on Trezor devices is one that is both convenient and highly secure.
Entering PIN on Trezor Model T
Use your finger or a stylus pen to enter the PIN by tapping the touchscreen of your Trezor Model T. The PIN matrix displayed on the screen of the device will shuffle the order of the digits after every attempt.
If you made an error and wish to retype a digit, use a yellow tile with an arrow in the bottom-left corner of the screen.
Once you enter the PIN, tap the green tile with a checkmark in the bottom-right part of the screen to confirm it.
Tapping the red tile with a lock will lock the device and discard your ongoing attempt to unlock the PIN.
Entering PIN on Trezor One
At first, it is probably much easier to grasp this concept if you are clicking on the tiles using your mouse - trying to match the position of the individual digits in the 3x3 PIN matrix.
If you are entering the numbers using the numpad on your keyboard, you also have to visualize the nine keypads on your keyboard as empty tiles. Again, you have to match the position of digits shown on your Trezor device screen. This position is randomly shuffled every time you connect your device.
Now entering your PIN should be easy!