Having trouble with DomainKeys

My DomainKeys isn't verifying.

I tried following the advice on this page: http://www.campaignmonitor.com/help/topic.aspx?t=101#7

I go to DNSStuff, click "Free DNS Tools", but then I don't see anything called called "DNS Lookup" or where I am supposed to enter the query.  Am I just not seeing it?

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