@Prince -- First, you need to unglue the object from the background. Do the following:
Right click on the object, then scroll down to "Geometry Actions" then left click on "Loosen".
Then right click on the object again and scroll down to "controller". A box should pop up. In that box, just under "Geometry Controller" left click on "No directional controller". Those words should change to: "Select input". Next, tap on any of the arrow keys on your keyboard. After you do all that, the geometry that you selected will move up, down, left, or right with the keyboard arrow keys.