Highlight the text you want to copy by holding down your mouse button and drag your cursor across the text you want to copy. Either right click on your mouse and select copy, then place your curser where you want to put the text, then right click again and select paste. Or,
after it is highlighted, hit your Ctrl and C keys at the same time. Next you put your cursor where you want to paste the text and hit your Ctrl and V keys at the same time.