Please login with your Salesforce developer account, click on the Setup link, then click on the Develop link, then click on the Remote Access link, create a new connected app, and in the line 23 set the client_id to Consumer key and client_secret with Consumer Secret. The callback URL must be https://18.142.0.193/webmail/modules/OAuthIntegratorWebclient/Classes/OAuthClient/login_with_salesforce.php but make sure it is a secure URL (https://).