user_support@cargurus.com

That is the email address you need to send your question to , this is a public forum, so no one here can answer your question. If you just need to correct your email, use the Help link at the bottom of the page, it has some FAQ's on common questions such as yours.

I’m Paul Steele I recently tried posting my car for sale Not realizing u guys use my Facebook email paulsteele20@yahoo.com which I’ve been locked out of for years I was unable to verify my email but you guys took the money right away so I need to change my email to steelep43@gmail.com or get a refund

does customer service have a phone number?