It´s very easy to interact with things that are happening on the home feed. You can like stories, comment on stories, play a game and scroll down the storyline.
On the top bar menu of the home page you should see 3 options. New Post (pencil icon), Search icon and the Chat (speech bubble icon).

New post: By tapping the “New Post” icon shaped like a pencil a new window pops up where you can post “What´s up”, Text, Images, Photos, Gifs and Links which will appear on your home activity feed.
Search: By tapping the search icon you can search for topics, friends and etc.
Chat: By tapping the chat icon you can chat with friends you´re following