This part is where you make the connection. You want the hostname here (change s4bres-world.com . Do not include www.). For your site, you'd change it to: yifan.lu
Code:
alias psnupdate {
  remove psnupdate
  sockopen psnupdate s4bres-world.com 80
}


This is where you choose the location of the page you want to retrieve. Basically, it's just the rest of the URL. So you need to change the /psn_update_finder.php?titleid= $+ %gid $+ &env=np part to match the URL. Note that $+ %gid $+ means to put the value of %gid in that place without spacing around it. For your site, you'd change it to: /psn/?titleid= $+ %gid $+ &env=np
Code:
on *:sockopen:psnupdate:{
  if !$sockerr {
    var %status sockwrite -tn psnupdate
    %status GET /psn_update_finder.php?titleid= $+ %gid $+ &env=np  HTTP/1.1
    %status $sockname Accept: *.*, */* 
    %status HOST: www.s4bres-world.com
    %status Connection: close
    %status $crlf
  }
}


The sockread event and parse alias also may need updated (I haven't looked to find out). Basically, both of those are how you parse the page. You want to look at the HTML of the page and find the results you are looking for. For example, it checks to see if "Invalid" is in the line and if so, it gives you an error message. Now, the existing parsing looks really convoluted and probably could have been done much more cleanly. Normally, you can just look for the lines thave have the information you need and use a unique value only found on those lines and check for that to do what you want. I don't know what to search for on the site to see what the page's HTML looks like, but it's probably fairly basic.