To reply to a message you must be assigned to it. If you are already assigned to the message, simply type your reply into the box and press 'Send reply'.
If you aren’t already assigned and you wish to be assigned to the case simply replying to the message will assign you to the case.
Or, you can click the 'Assign it to yourself' button at the top of the message.
If you cannot see the 'Messages' section within Stribe it means that you do not have the correct permissions to complete this action. Contact your main system Administrator to gain permission for this action.