Hello,
thank you for you question.
For Contact Form in Sweet Home - Real Estate Joomla template we use Joomla forms from Balbooa.
www.balbooa.com/joomla-forms
You can easy change email of receiver or fields of form via admi area. You need go to joomla admin area - components - forms.
If you will have any questions, please ask.
Best Wishes,
Taras
OrdaSoft team