1. In button properties under "Action" tab, under 'Select Trigger' set as Mouse UP and under 'Select Action' set it to "Reset form" then select which fields you want to reset.
2. This depends what exactly you want to do. If you just wish to add "Save As" button, then repeat steps from task 1 but instead of "Reset form" select "Execute a menu item" and then select "File>Save As...".
3. Same as above just under 'Select Action' choose "Submit form" then select last option "PDF to a complete document"
In the bar at the top enter: mailto:your address goes here.