On Android app, you can directly send an email, or add user to your contact list. Just tap Email button.


On website, you can email user by click Message link on the profile of the user you wish.


Private Message 

First you need to add user to your contact list.

He or she must approve your friend request before you can see them on your contact list.

Just tap on your contact list on Android app or Web-IM to start conversations.