If you can't sign in to your eBay account Make sure Caps Lock isn't on. Look for spelling errors. If you recently changed your username or password, your browser might remember your old information. Try manually entering your new username and password.

When was the last time you used the old account? eBay does purge accounts after a long period of inactivity - they send you an annual reminder to login to verify your info so your account remains active. If your account was purged, there is no way to get it back.

On desktop, you can find My eBay at the top right of most pages, and once you've signed in, you'll find everything you need under the Activity, Messages, and Account tabs.

Click on the listing you wish to purchase. Next copy the URL at the top of the screen that is in the browser bar. It will start with https://www.ebay.com/itm/ Then it will have the item number of the listing.