Replace Landcore

Step 1: Click on "Edit Land" button in bottom left corner of screen.

Step 2: Click on "Blueprint" button in upper left corner of screen to access Blueprint Editor Mode.

Step 3: Click on Blueprint from Inventory that you want to modify.

Step 4: Click on Modify" button.

Step 5: Click on Landcore in the island.

Step 6: Click on button.

Step 7: Click on Landcore in inventory to replace with the old one

Step 8:

Click on "Apply" button to save your change

or

Click on "Reset" button to reverse your change.

Now you know how to modify your blueprint.