How to search using item number

[topcatbella]

Trying to find a specific item using it's Item Number but cannot find at way to do it 

[tressygirl]

Go top right of thie page and click on Advanced,  next to the big blue Search.  Add item number on the left,  click on Search on the right.

Don't use the useless ebay app to do this,  but use a laptop / PC / browser,  but again  not IE.