Haskell Riak driver: Making a simple 'put' operation -

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I am trying to present myself in Riak with the Haskel driver and I will put a simple / Code> operation I am confused with the signature of the put function 

  put :: (fromJSON c, tojson c, resolvable c) =>  
 With this signature:  connection - & gt; Bucket - & gt; Key - & gt; Perhaps VClock - & gt; C -> W - & gt; DW - & gt; Io (C, Whicklock)   
 I have a few questions.  
 What is a VClock? Do I have to generate it somehow or is it not enough just to specify anything? And why do I get this VClock in the returning tube?  
 Do I have to write IJSON and ToJSON examples for every simple value, even if it is a simple string value? Like I want to "sew" a value with the key "name", how do I do it?  
 What is  resellable  example? How do I solve a text or string value? I understand that I have to define the  resolution  function, but I do not get enough of what it means and how to do it.

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