Right click on the bottom panel and choose New Panel. Then you have to add
items that were on your old panel by right clicking and Add to Panel. By
right clicking on an item on the Panel you can move it unless it is locked
in which case you will have to unlock it first. You can change a panel
setting by right click on a panel in a blank area of the panel and choose
Properties.

This is all very well and good for as long as you are running an older
version of Ubuntu, but Classic GNOME (used in 10.10 and available for 11.04)
will be defunct soon. Ubuntu is killing it off with 11.10 and GNOME will do
so shortly afterwards. Each wants users to use their latest desktop, Unity
or GNOME 3. This is a big reason to not upgrade past 11.04. You will still
have it available in the repositories for as long as that version is
supported. Anything beyond that and you are out of luck and will be forced
to learn a new interface.