This way i am going to explain doesn't require you to download himachi, but simply uses your hackpatch to target a private servers IP.
1.) Find a private server you want to play on and find its IP. Example=255.255.255.255
Or find a host ip.
Example=wowemu.iphost.website
2.) Now open up your hackpatch and goto where you put in an IP, put the desired private servers IP in instead. now run it and let it apply the ips.
3.)Now you just create an account and what not and you can connect. as simple as pie!
I dont know why but it seems im the only one in the Emulated servers forum to know of this method! So I decided to share.