Open Minecraft Java Edition. The latest release is best, though older versions back to 1.7 can connect too.
Multiplayer → Add Server.
Server address: play.clutchborne.com. Leave the port off.
Join. The first time, there's a quick few-second check, then you'll rejoin automatically.
Accept the resource pack for the custom items and HUD. It's optional, but recommended.
Bedrock Edition
Play → Servers → Add Server.
Server address: play.clutchborne.com
Port: 19132
Join from phone, Windows or tablet. Bedrock gets native menus instead of chest GUIs.
Consoles can't add custom servers without a workaround. Look for a Bedrock server-list helper.
Once you're in
You'll spawn in the lobby sky islands. Walk into a portal or open the compass to pick a mode: The Outlands, 1v5 Gauntlet, Yikers Rush or Loot or Leap. You can also type /outlands, /gauntlet, /yikers, /leap or /duels, and /lobby takes you back. Playing with friends? /party invite <name> works from anywhere: when the leader switches modes, the party follows, and /pc is party chat. /quests shows today's quests. Stop by the Hall of Clutches, north of spawn.