Open Minecraft and press Play. Then, in the top right, click the “Servers” tab. Scroll down on the left side until you see the small “Add Server” button at the bottom. Click it, then in the field titled “Server Name” type “CaveCraft“. Next, in the field titled “Server Address”, type “survivaldirect.cavecraft.net“. Finally, in the field titled “Server Port”, type “8073“. Now click “Save“.
It should bring you back to the server list. Scroll down on the left side again, and under “Additional Servers”, click on the server titled “CaveCraft”, then in the right side there should be a “Join Server” button. Have fun!