Hi Luccena,
1)Double click on ur "Save" button.
2)In the button properties dialog,Click Rules button.
3)In the Rules dialog,Click Add button
4)In the Rule dialog that opens, Click the "Add Action" button to select the "Submit Using Data Connection" action in the dropdown
5)Now click the Add button again to proceed.
6)Now u can select the data connection to submit data to a SharePoint Library or thru email.
Regards,
Abhishek