Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
To change the properties of the panel, which by default is on the bottom edge of the desktop, you need to access the Panel Tool Box widget located on the extreme right edge of the panel. Depending on the distribution you are using, the panel could be locked or unlocked.
Read the complete article at http://www.linuxbsdos.com/2012/06/05/how-to-change-the-height-and-position-of-the-kde-panel/