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.

To like a profile when you're in the community, click on the user's name twice and then click on the arrow to expand their profile and scroll down to the bottom of their page and click on the heart icon

When someone likes your profile, you will receive a notification that they have liked your profile. From your notification tab, you have the option to like them back by clicking on the heart icon next to their notification"

You have to Like or Friend people to start a conversation with them so..... what are you waiting for! Go!!