Right click on the TimeMachine icon on the desktop. Get Info will come up as an option, the third option down in the list.
Click on Get Info.
The Window Pane for Get Info will come up on your screen. Most often on the left.
At the very top left of this window pane there is a little green icon, the Time Machine icon. It will have the name of your Time Machine drive next to it.
Lower down, second from the bottom of that window, is the word Preview. It has an arrow next to it. Click on the arrow and it will show you a picture of a Green timeMachine drive. Hover over that with the pointer, and click your mouse button, keeping it down, drag that image up to the top and hover it over the little image at the top of the open window. Your actual TimeMachine name right. When you see the plus arrow appear (+) let go the mouse, and you may have to type in the password, and it will replace your yellow icon on the main screen, with the Green Icon.