Hello, I'm not sure why you can't find it on your favourites anymore but you should be able to find it on the browser list if not heres the IP address to connect to them.
Just type ' Connect <IP> ' in console without the quotes.
Semi-Serious RP Server 1 | - play.zarpgaming.com:27015
Semi-Serious RP Server 2 | - play.zarpgaming.com:27025
Semi-Serious RP Server 3 | - usa.zarpgaming.com:27015