Frequency lists cannot be obtained via the CHN web interface. Instead you can download n-gram lists with frequency information for free via:
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http://hdl.handle.net/10032/tm-a2-p7 (for commercial use)
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http://hdl.handle.net/10032/tm-a2-p6 (for non-commercial use)
Both require the registration of a separate account at IvdNT.