To copy & paste a website address into an e-mail, left mouse click on the website address at the top of your screen. That's the bit starting with htt://......
It will be highlighted in blue. Then hold down the ctrl key and the "c" key at the same time, this will copy the highlighted text. Then go to your e-mail and place your cursor where you want the address to appear in the e-mail. Now, if you press the ctrl key and the "v" key at the same time the copied website address will appear in your e-mail.
Hope that makes sense.