Click this link and read every step before proceeding:
I'm now going to step you through each step because I know you didn't read the list... Click the link above.
Download the client ahead of time (that means right now). Bandwidth is expensive; if you're Mac the client is currently hosted on Mega and at one point unless you pay for an account you will have to wait six hours to complete the download. If you're PC the file is a torrent. If you need a torrent client use QBittorent. Both uTorrent and BitTorrent are both adware now.
While the client is downloading click the link and set up your Twinstar account. You will need to email verify so make sure you do that as well. I've had three separate people ask for help because they did not do this.
If you are on Mac make sure to extract the World of Warcraft folder to your applications folder. (This will be important later if the game wont start on you).
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.
If you're on Mac and the game crashes as it's starting up:
You need to run the game as a super user. In order to do this. Open up Terminal and paste in "sudo /Applications/World\ of\ Warcraft\ Classic/WoW\ Classic.app/Contents/MacOS/World\ of\ Warcraft" without the quotations. This is why I had you install the directory in applications. If you didn't listen and installed it somewhere else then go back to step 4 and also smack yourself for me.
If that does not work and instead you get a bunch of text you need to run your computer at a lower resolution.
If you're on PC and you cannot connect to the Kronos server:
Make sure that your realmlist.wtf is saved without any other file extension at the end. For example, make sure it is NOT saved as realmlist.wtf.txt .
If you're on Mac and you cannot connect to the Kronos server
It is the same process as with the Windows step but use TextEdit and make sure that your file is not saved with an extra extension after the txt.
If you still can't figure it out:
Don't email me. Post a comment below instead.