Three start point

Hi every one. Can i ask for the machine Three in start point is still alive. How i can use the command=id.
I upload shell.php already but the url is not work for use cmd.
I try 10 times but it is same problem. I do not have any idea for that. any one can help me plssssss!!!

get /shell.php?command=id HTTP/1.1
response : HTTP/1.1 404 Not Found

I had checked in aws in thetoppers.htb, there was shell.php aleady.