Hi there,

You need to enable this module https://screencast.com/t/6FZuWraRG on your end in order to show them. I have enabled them and it should shown as it should now.

One more question. Is it possible to send an email alert to all users for every new post added to the general stream?

Unfortunately, it is not possible to achieve this currently

Having said that, it would best if you could submit your feature request regarding this simply by creating a new ticket on the forums, and set it to "Feature Request" so everyone else on the site could vote for it as well. The team will usually prioritize features that are in popular demand during the development process of the next major release.