To copy a link:
Right-click the URL in the address bar.
(it turns blue & a menu appears)
Left-click
Copy, or press "C".
Right-click in the
"Reply" box.
Left-click
Paste or press "P".
It becomes a hyperlink automatically.
It might break if it is very long, or contains special characters.
In that case, compress it with
http://tinyurl.com/
Hope that helps.