The following article will cover the steps needed to add tags to your Rust Server Hosted By Host Havoc.
1. Log into your game panel.
2. Click on the Configuration Files icon in your game panel.
3. Click on the Config Editor for the server.cfg.
4. Locate the Server Tags portion of your config and add your tags.
5. Click on Save and Exit.
For a detailed list of tags https://wiki.facepunch.com/rust/server-browser-tags