How to use Macbook keyboard for playing notes in Ableton

How to use Macbook keyboard for playing notes in Ableton

How do i play notes on the keyboard on my macbook?

I used to be able to but for some reason now i cant, i like to text the sounds before writing in the notes by hand, the keyboard sign is activated on the top right corner but still doesn’t work?

Cheers

Ableton Live Tutorial: The Computer Keyboard as a MIDI Controller