Navigate to the Menu and click on Site Settings.
Click on the Available Features link near the top of the page.
Click on the Discussions option*.
Click on the On/Off toggle to turn the Discussions feature on.
Choose whether Discussions should be enabled on Activities by default (this can be overridden at Activity level) by using the toggle switch.
Choose whether to Enable General Discussions by ticking/unticking the box - these are Discussions which do not relate to a specific Activity.
Decide on which Roles can administer Discussions by ticking/unticking the boxes. The options are Super Administrators (default), Administrators and/or Content Creator. You can choose from any combination which suits your Organisation.
Decide on who can participate on Discussions on a global site level (this can be overridden on individual Activities). 
Click on the dropdown menu to choose from:
| All Users | Anyone can view and participate in a Discussion related to an Activity whether they are registered onto the Activity or not. |
| Registered Users | Only Users who are registered onto a specific Activity can view and participate in a Discussion about it. |
| All Users, but only with assigned experts | Any User, whether they are registered onto the Activity or not, will be able to participate in a private Discussion with an Expert. |
| Registered users, but only with assigned experts | Only Users who are registered onto a specific Activity will be able to participate in a private Discussion with an Expert. |
| Registered users and all users can view | All Users can view the Discussions but only Users who are registered onto the Activity can participate in the Discussion. |
Click on Save when you have chosen the all of the options you'd like to use.
*If you cannot see Discussions in the Available Features section, you will find it in Manage Features and it means that Discussions have already been enabled.