Your aim here is to move the white edges such that they surround the yellow center at the top of the Rubik's Cube.
The first 3 edges will be easy, just try! I am sure you can do it!
The last edge can be a little tricky. Below are 3 cases that you may face.
If the color scheme of your Rubik's Cube is such that yellow is not opposite white, use the color opposite white instead of yellow as written above.