To locate your Add-Ons folder: * Right click your Blockland Shortcut * Click "Properties" * Click the "Find Target" button ("Open File Location" in Vista) * This will open your Blockland folder * Open the folder labled "Add-Ons" * This is where you put new Add-Ons
Now locate the add-on you don't want, and then select it (single click) and press the delete key on the keyboard. (Or Right click -> Delete)