You can reply to topics ( under Geoffrey Hinton Fellowship) only after joining the community. To join the GHF discourse community, you have to send a request to the admin. The process is fairly straightforward.
1 Go to the top right corner of the screen.
2 Click on the hamburger menu ( the menu on the right of the search option).
3 You will see an option of “Groups”. Click on it.
4 You will see the different groups where you can send the request to join. Click on the request button on GHF.
You will be added to the community as soon as possible.