Problem uploading to board.
The error message is as shown below
avrdude: ser_open(): can't open device "\\\\.\\COM1": The system cannot find the file specified.
Arduino uno is physically connected to computer but in menu "port" option show nothing.
i am using window 10 OS.
Arduino First-Arduino-Program 04-05 min 40-50 sec
Please go through the Additional Reading material link of the "First-Arduino program" tutorial.
Use command line to execute the commands as you are using Windows.
Information about errors and solutions are given in the below link.