By default, Siimple sets your contact form's email address to the one that you used when you created your Siimple account.
1. To view or change this just go to the 'Settings' tab at the top of your Site Editor
2. Scroll down to the field that says 'Contact Form Email'
3. Enter in your email address and hit 'Save Changes'
⚠️ Make sure to publish your site when you are finished in order for the new email address to take effect.