To begin rearranging meters, click Settings in the toolbar.
In the bottom right corner of each meter there are three buttons:
The the left arrow and right arrow buttons will swap the meter with the one on either side.
Clicking the middle button (the arrow facing upwards) will remove this meter from the main layout and place it in its own separate window.
To disable meters you do not want to use click the Settings button in the bottom-right corner of MiniMeters.
Next, click the name of the meter you wish to disable. This will hide the meter.
Clicking the name again will enable the meter once again and add it back to the layout.