It is only simple if you know what you need to do and that forum post doesn't help much if you don't.
* In the top right of the menu click the Bell icon, the audio level icon **or** the switch off icon (Red 1) 
* Determine that there are **two** cogwheels/gears in the area that just openened. The one at the bottom is the general settings, which you don't want. Click the cogwheel next to the Notifications TAB (near top right of the screen) (Red 2)
* This opens the Budgie Settings, click on the Panel TAB at the top
* The second row should say Position Top, change that to Position Bottom
The world did not open near my place, YMMV.