First select the text. You can do this by pressing and holding the left mouse button, then drag the mouse cursor over the text you wish to select. Then press and hold the Ctrl key, and then press the C key.
To paste the copied text place the blinking cursor where you want the text to be inserted, then press and hold the Ctrl key, and then press the V key.
First select the text, then right click it, and select Copy.
To paste the copied text place the blinking cursor where you want the text to be inserted, then right click again, and select Paste.