Get on

1. Install Prism Launcher and sign in with your Microsoft account.
2. Add Instance, Import, pick the .mrpack you grabbed above.
3. Multiplayer, Add Server, and paste the server address from up top.
4. Ping me your username so I can whitelist you, then hop on.

No Microsoft account?

Old un-migrated Mojang account, or none at all? Ask me for an invite, then:

1. Use FjordLauncher Unlocked instead of Prism (a Fjord fork that doesn't make you add a Microsoft account first).
2. Open my invite link and make your account. Drasl then shows you exactly how to add it in the launcher.
3. Then do steps 2 to 4 above. Same pack, same everything.