If you want to change this to bottom of your desktop follow this procedure
Make sure you have upto date ubuntu 16.04 desktop using the following commands
sudo apt update
sudo apt dist-upgrade -y
After installing all the updates it is better to restart your desktop to refresh all the changes.
Now you need to install dconf-editor
DConf is a low-level key/value database designed for storing desktop environment settings.This package contains the command line tools. Note that DConf is not connected with the older Debian package named dconf.
sudo apt-get install dconf-editor
Now you need to lauch the dconf-editor using the following command
Go to com--unity---launcher on the right hand side change launcher positon change from left to bottom.After the change you should see similar to the following screen