change email addres with http request
This can best be done through the Email object.
Find the collection of Email objects having contact_id 14330. Take the first object and use its id to change it:

issue a post request with

{ :entity=&gt; 'Email',
   :id=&gt; *EMAILID*,
   :email=&gt; 'NEWADDRES@gmail.com',
   :action =&gt; 'create'
}