From Wix.com

How do I delete a site/document/layout I've created in Wix?

It’s easy to delete a document/site you have created in Wix

BUT BE CAREFUL! Once you've deleted your document we can't get it back for you!

As you can make an unlimited amount of sites/creations for free with Wix we suggest you simply keep it in your My Account.

However, the steps are below in case you really do want to delete it.

Step 1. Go to My Account

Step 2. Rollover the creation you wish to delete

Step 3. Click X

You will be asked again if you are sure ... (yes yes we know but we can NOT get it back for you)

Step 4 That's it, you're done. You document should not appear in your My Account gallery (after you refresh)