I'm almost certain you're a troll, or possibly just stupid, but I'm going to tell you anyway.
How to download add-ons
1. Go to the add-ons section of the forums and find the add-on you want.
2. Click the download link provided by the add-on creator.
3. If asked where to save, save to your add-ons folder located in your Blockland folder. If you aren't asked, move it there.
4. Start Blockland.
5. Click Start a Game.
6. Click the add-ons tab.
7. Check the box next to the add-on.
8. Start.