InfoPath Dev

I have a Phone Directory list. I open the form and it show all the records (Secondary Data Connection).

I want to update any record in the form. How I make the connection to save the changes?

For example:

I have record that contains info of Kevin, I want to change the name Kevin to Kevin Rodriguez.

 Is this Phone Directory List a SharePoint List? You would have to customize the list form or you would need to use code, qRules or CAML to write back to a list if the form is not a list form. I'm sorry, this is just not something InfoPath does easily out of the box.