unable to connect to the Serv-U Server from the browser

Please I just installed the Serv-U MFT server but I have not been able to connect to it through the browser neither can I do an FTP to the server even with the local IP of 127.0.0.1. What do you think could be the problem ? I am a first time user of the application and I want my clients to transfer files to me through the SFTP or HTTPS.