I’m a total newbie.
Can anyone help please? The bottom bar,Task Bar??, has just disappeared - does anyone know what I’ve done and how to get it back?
It depends on which system you are using.
If you have a peanut like thingy in the top right corner of your screen, then you are using KDE 4, and then you can simply right click on your desktop and select add panel.
You will get an empty panel on the bottom of your screen, and then you can right click on the panel and add all the widgets you need.