Hi Dutch,
I start with some advice: Don't post Dutch on a English forum.
Not seeing the new password you type is normal:
Type a new password and press ↵ Enter. The password you type will not appear on the screen.
Retype the new password and press ↵ Enter. You will see a message that reads “password updated successfully.”
Source:
https://m.wikihow.com/Change-the-Root-Password-in-Linux
https://raspberrypi.stackexchange.com/q ... a-password