How do you place blocks in mineblocks?

In Mineblocks, you can place blocks by selecting the desired block from your inventory and then clicking on the spot in the world where you want to place it. Make sure you have the block selected in your hotbar, and position your cursor over the area where you want to build. You can also use the right mouse button to place blocks directly. If you're in creative mode, you can access a wider variety of blocks to use.