You cannot send a message to eBay staff
You can go to eBay help at the top of any page and type 'speak to an agent' in the chatbot
Or do you need to message a seller on eBay?
Or, without giving any personal information, you could ask other members here if you need help/advice with something
Unlike eBay staff who type from pre-written scripts and who have experience using the site, members here will provide factual information, based on eBay policy