Now it's time to paste the part of the text you copied. If you use a laptop PC or in any case a touchpad instead of a mouse, you can right click click with two fingers on the trackpad surface. After highlighting the part of the text that interests you, click the right button Hover over the selected area and in the drop-down menu that appears on the screen, click the option copy. Wondering how to use the mouse copy and paste on macOS? First, open the file or web page that contains the text you want to copy then select the part of the text that interests you by holding down the key left button mouse and dragging the cursor over the text itself.