maltego yahoo api key

Hi
After rave reviews on PaulDotCom I've started playing with Maltego but
the Yahoo API key is usually exhausted so I've tried to sign up for my
own. I signed up for a yahoo developer key from here
http://developer.yahoo.com/wsregapp/ which gave me a url specific key,
is that the right one?

If so, where do I enter it. I tried putting it in the key field in the
transforms page but that then overwrites the keys for every transform.

If not, which key do I sign up for? And where do I put it once I've signed up?

Thanks

Robin

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