I have a Mac computer and paste in a different way (I think) to Windows.
1. Go to the page you want to paste.
2. Highlight the address (it starts http:/www)
3. Go to Edit and press copy.
4. De-highlight the page
5. Open another window on the page you want to paste on
6. Finish writing whatever you are doing and then go to where you want link to appear. Go to Edit again and paste.
Hey presto - done.
When you have finished it won't appear as an active link but on the preview it will!
(if that makes sense)
I am aware that this may seem long winded, but in reality, it doesn't take very long at all - honest.