Custom Field help with URLs (+ clickable icon)

Hi all.

As a new user I am trying to get to grips with customs fields. I have created a custom field that I want viewable below the members avatar when viewing posts, but as per the attached thumbnails I have not done something right, which you can see for the 500px URL.
Screen shot 2012-01-05 at 17.51.50.png

I have set the value requirements to URL, but I am unsure of what to put in the Value Display HTML, but this is what I have right now.
Screen shot 2012-01-05 at 17.57.15.png

As an aside, is there a way I can have an icon displayed instead of the URL as it looks a little ugly below the avatar to have http:// showing. So, an icon that when clicked, takes you to that web address would be great!

Thanks in advance for any help :)
Excellent, thank you, that worked nicely!

My only other issue (which I forgot to mention) is when I click the link, instead of being taken to that web address I get an error message and the URL in the address bar has the forum address plus the link I want to be taken too, but it is mixed up like this:
Using value and not value Url fixed it, thank you :)

One last thing (apologies) is it possible to somehow make this link open in a new window/tab when clicked on?