Lost menu button

[jacatone]

How do I restore that gear shaped start menu icon. Accidentally deleted it. Also how do I move all those icons like wifi and notification icons back to the right side?

[Snowhog]

As to the start menu icon. Right-click on a blank area of the Panel and click Add Widgets...

Search for Application. There are three to choose from: Dashboard, Launcher, and Menu.

[claydoh]

Also how do I move all those icons like wifi and notification icons back to the right side?

You need to right-click on the panel, and edit, and then move things around. if unsure, post a screenshot of your panel or desktop. The system tray moving to the left could mean other widgets are moved or deleted -like the taskbar

[jlittle]

The wifi and notifications are "entries" in the "System Tray" widget.

But what puts the tray on the right, for my panels anyway, is the "Fill free space on Panel" setting of the "Task Manager". I expect there are other widgets that behave similarly.