In order to play on Kronos, you need to follow these simple steps.
1) Install/Download the game client:
(If you already have a copy of the game with patch 1.12.1 installed, delete your WDB folder and jump to step 2.)
2) Create a game account:
Create your Game account at https://manager.twinstar.cz/
3) Set realmlist:
In your World of Warcraft folder open the file realmlist.wtf replace any existing entry with one of the following possibilities, save and exit.
set realmlist west.kronos-wow.com
set realmlist north.kronos-wow.com
set realmlist east.kronos-wow.com
Each login server will connect you to the same realm, but the path that each server takes is geographically different. This means that you can try each realmlist and see which one provides you with the lowest latency.
You should be able to connect to Kronos now.
4) The Kronos Team wishes you a lot of fun