While in an active log, you can send messages by SMS and Email.

Click on "Send message" icon.

You can now search for individual Teams, Users or Contact lists, that you want to send the message to. 

It is also possible to "Send to all members of active teams". This will notify everyone that has been invited to this specific log.

Type in the name of the Team, user or list you want to send to. You can also combine Teams, Users and Contact list to the same message. Like this message, which will be sent to the "Management" team, and the user "Thomas Henderson".

Add your message, and then select "Delivery method". By default, the message will be sent as both Email and SMS. But you can change this by clicking on the icons.

When you are done, click "Send message".