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There are few examples related to getting html user data as user updates the related fields.
Please take a look at WICED Wi-Fi Forums and Re-purpose GPIO in Evaluation Board To Drive Motors.
Basically you need to define the message handler for user updated data from the html pages and parse the received message in the handler.
Both examples implement buttons but text fields message receiving is similar as well, "First Name: <input type="text" name=FirstName/>"
Hope it helps.