What if you don't like where that icon was placed?

Luckily you can move items on the panel with the "move" command of the context menu. Just click the icon you want to move with the right mouse button.

A menu will pop-up and you can choose Move. Now move the mouse and see how the icon follows while still staying on the panel.

When you're done, click the left mouse button and the icon will be set.

You may have also noticed the menu entry Remove in case you're tired of a certain launch button on your panel.