You do not buy from other members on the forum (unless that person just happens to be a seller on eBay)

Other members have no idea if you are on the real eBay site

If in doubt, do not proceed  and countact your bank 

Are you on the real eBay site?  Is there a padlock or lines in the URL that if you click on says 'secure site' 

Yes, I am on real ebey site. there is a padlock and said Your payment is secure.

Yes that is normal as it is with most sites.

But I am only a member her, so can you trust me.

"Hi, I am going to buy a product from you"

You're not buying anything from eBay. You're buying from someone who sells their items on ebay, the seller.

If you're on the real eBay site, no-one else can see the numbers you've typed in