I'm nobody! Who are you? Are you nobody, too?

Don’t worry, you’re not alone. I had a hard time finding it too before :)).

But anyway, all you have to do is click the “Customize” button at the sidebar right here —————————->

Then Click the “Community” Tab above your profile.

There you will see these:

Replies

Let People Ask Questions

Let People Submit Posts

Just check on whichever feature you want to enable, edit the title and other thingamagies, then click the “Save + Close” Tab at the upper right corner.

There you go. :))