Go to Chat Room.

Select the Chat Room tool from the Tool Menu of your site.
Choose Permissions.

Modify the permissions for the roles listed.

- Check the box next to each permission you would like to allow for a given role. Un-checking a box will remove the corresponding permission.
- Choose Save.
Note: You may see different roles listed depending on the roles that exist in your site. A role must be present in the site in order for you to modify its permissions.