Everytime I try to send a message to my classmates , it won't send the message.

Everytime I try to send a message to my classmates , it won't send the message.
Hi Kelvesia,
Student-to-student messaging is currently disabled by default on Schoology, but it may be helpful to speak with a teacher for ideas about creating a group forum where you can exchange messages with your peers.
Sincerely,
Julie
Where do you change that?
Why I can’t send a message to my classmates
can you change this