Hi Shalom:
What contact box are you referring to? Perhaps a screen shot might help or a reference to how you added the contact box you refer to (is it one of the wix contact form contact tools?).
If you are using a contact tool then you probably want to consider creating your own contact form if you want to remove email. Depending on what you are trying to do you might find this helpful:
Also why would you want to remove email? Just curious because that is probably one of the most unique pieces of contact information that you can have to identify someone (or a mobile phone number would be an alternative).
Steve