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• Here is link that show me on how to move icons in Ubuntu Unity task bar, https://askubuntu.com/questions/39805/is-there-an-easy-way-to-rearrange-or-move-the-icons-in-the-unity-launcher.
• The solution is to click at the icon I want to move and hold it for a while. After that the icon can be moved in to new position.
• Here is the animated .gif explanation.

./20170712-1451-cet-how-to-move-icons-in-ubuntu-unity-taskbar-1.gif