You will need to create a Game Server Login Token (GSLT) if you'd like for your CS2 server to show on community servers. Here is how to create that token:

Step 1: Using your preferred browser, navigate to http://steamcommunity.com/dev/managegameservers

Step 2: You will need to login to your steam account. Once logged, you should see a screen like this, please enter 730 for the game id: 

Step 3: If you receive an error, you will need to add a phone number to your Steam account via this URL: https://store.steampowered.com/phone/add

Step 4: Take note of the token that is provided as you will need it in a few steps

Step 5: Log in to your Host Havoc game panel.

Step 6: Click on the command line manager and then click on the word Selected beside your chosen command line.

Step 7: Locate the GSLT section and paste your GSLT here and then click Apply.