Plug a single end of your serial cable into the console port (often called a serial port or DB9 RS232C asynchronous serial port) on the RouterBOARD and the other end inside your PC (which with any luck , runs Home windows or Linux). You can also use a USB-Serial adapter. https://winboxmalaysialogintips19986.goabroadblog.com/34431430/facts-about-winbox-log-in-revealed