Chartmat makes it really easy to move your blocks around in order to create the perfect layout. This is how the order works:
If you want to move a block, simply click on the move button in the top-right edit menu:
The block will move one position above which means either to the left or one row up.
If it's the first block, it will move all the way to the end. This way you can setup and sort your block as you prefer.