What is the email address for ebay, please?

I spent three hours listing my first item to sell on ebay. Finally, I had one more thing to do and this was to click onto the 'Continue' button. When I did this, a message came up saying that a PIN Number would be sent to me via my phone or text. I added my phone number and clicked 'Text.' A message came up telling me to put in a valid phone number. I did this many times over and the same message kept on coming up. I gave the number to my house mate and I asked him to call my number. My phone rang. I got him to text me too, and I got the text. When I tried to go back to the product I was listing to sell, it had vanished.

When I went to Customer Support, they had no category under "Selling An Item" for the problem I was having. After spending another hour trying to get Customer Support and not getting it, then I have come here. Thank you