For premium accounts:
Step 1 Join Site 21's Discord!
Step 2 Download the Technic App.
Step 3 Logon with your Minecraft account.
Step 4 Go to here.
Step 5 Click install this modpack, and paste link in the Technic.
Step 6 Download the pack then click play.
Step 7 This part onwards is if you only want to play on the server On the main menu screen press "Site - 21" (there is no IP for the server)
Step 8 in chat. Type in /verify [YourDiscordName]#[DiscordTag] E.G.
Step 9 On the Site - 21 you will have to navigate to #verification then type +yes
Now you have Joined! Do /class to show your classes, also don't forget to apply for LvL 1 if you want to roam the Site freely!
- Credits to ConnorTron110 for making this tutorial