The following article will cover the steps to log into admin on your Arma 3 Server Hosted By Host Havoc.
1. Log into your game panel.
2. Click on 
in your game panel and then click on the 
for the server.cfg file.
3. Locate the passwordAdmin = section and take note of the password in this section.
4. Launch Arma 3 and connect to your server.
5. Press the / key on your keyboard to open the chatbox.
6. Enter the command #login yourpasswordhere to log in as an administrator.
For a complete list of Arma 3 admin commands, please see the following link
https://community.bistudio.com/wiki/Multiplayer_Server_Commands
