See sellers stash tab and number of item

Could someone be so kind to explain to me how exactly I can see in which stash tab is the item I want to buy from someone? I was asked by a seller but I could not handle it. Is thera a sort of how to in details?

Thank you ;D
Last bumped on Feb 9, 2018, 1:08:32 PM
This is found with the copy paste link from POE TRADE usually

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