Edvoice allows conversations between teachers, parents and students, both individually and in groups. To start chatting with another user you just have to click on the option Chats that appears next to the Stories.
Once you are in the Chats, press the text balloon with the + button that appears in the upper right part of the screen. At this moment you will see the list of users with whom you can chat. You will see that depending on the type of user, an icon or another will appear to differentiate them (for example, a father and a son who are called the same).
Clicking on the name will open the chat to be able to speak with whomever you want.
In the details of a Chat you can see the list of members of it, or leave the Chat to not receive more messages.