If you want to assign other users permission to comment in your chats, you can create a unique role for them. To do this, right-click on the "server name" on the left-hand side of Discord's main page, then click on "Server Settings -> Roles." On this page, click "Create Role" at the top, name your role, choose a color, and grant special permissions under the "Permissions" tab. Return to the Read-Only channel's "Settings" and click on "Permissions" in the left menu. Use the dropdown to the left to select the role/member you want to authorize for comments. Click the green checkmark next to the "Messaging" options, then click on "Save Changes."