To join Ender's Minecraft server from your Xbox, you need to download and install Minecraft from the store or purchase a physical copy and add Ender as a friend. Then, you can join the club.
Requirements
An Xbox Series X or Xbox Series S
A Microsoft account or access to an email address
An Xbox Game Pass Core membership (from $9.99/month)
Overview
Purchase and install Minecraft for Xbox
To play Minecraft on Xbox, you need to buy a copy from the store or, if you have an Xbox with disk reader, you can also buy a game disk from any retail partner. Minecraft for Xbox is $20.
Depending on your Game Pass membership, you might be able to access Minecraft without a separate purchase. Navigate to the Xbox Game Pass section on your console, find Minecraft, and select it to download and install the game.
On your Xbox, navigate to the Xbox Store by pressing the Xbox button on your controller and selecting "Store"
Use the search bar to type "Minecraft", enter, and select "Minecraft" from the results. It should be priced at $19.99 depending on the edition and/or region
Click on "Buy" or "Add to Cart" and follow the on-screen instructions to complete your purchase
After, Minecraft should either automatically start downloading or you might need to click on “Download” to initiate the download process
Once the download is complete, Minecraft should automatically install on your Xbox console
Press the Xbox button on your controller to open the guide, then navigate to “My games & apps” to see if Minecraft appears in your games list
Join the Minecraft Club server
Open up Minecraft on your Xbox and click on the "Play" button
Click on the "Friends" tab in the center of the screen
Now locate and press the "Add Friend" button
A new window will pop up. Enter "joinender" and proceed
Back in the "Friends" tab, locate "Minecraft Club". It might take up to one minute for it to appear
Once it's there, click on it to join for the first time. Make sure to do this together with your kid (there might be a surprise waiting for you)
On the pop up, check the box and lick on "Proceed"
Congratulations! You've installed Minecraft on your Xbox and successfully joined Ender's Minecraft Club server for the first time. You're ready for the club!