Help with server

I just got a garry’s mod server and i can connect, but when my friends search for it, it doesn’t show up. Also, Yesterday, i was in the server, so i told my friend to look on the friends tab to join the game but it wasn’t there. Is there something i need to do?

[editline]05:32PM[/editline]

please help

You need to port forward. I don’t know how but look it up, or someone else can help you.

Port forwarding depends on the type of modem you use. For me i only need to enter the paserel (or Ip) of my pc in a web browser, then enter some password that should have when you make your internet connection. And finaly it get me to a page where i can forward my ports