In the 'Meet' section of the app you have the option to Like (swipe right) or Pass (swipe left)

When you expand a profile, you have the option to Add Friend

When you Like and/or Friend someone's profile, it will send them a notification that you have Liked/Friended them and that you're down to chat.
If you are viewing a profile from the Community, then there will be a big heart at the bottom of the screen, and that is the equivalent to swiping right
You have to Like or Friend people to start a conversation with them so..... what are you waiting for! Go!