User Activity

Ive been buying a few times from China lately & each time I have to re-type my email address & passord as the msg says its incorrect yet I know its not. I'm getting tired of changing my password yet this practice is spooking me. Any suggestions?
Ive been looking at 2 old chairs that have been listed a few times & was hoping the seller would list at a lower price. They have a bid & a 2nd bidder looks like schill bidding to me. Is there any point in reporting it or do I need proof?Item 1814729...