Treat it like eating food: select it as your active item and your avatar will hold it up, then tap it. My problem is I don't know where to ever view it again (see my Support thread from last night)!
It sounds like you're looking for a new tab along the top, but it's a tab along the side. If you go to the icon that looks like a gold bag (I guess that's what it's supposed to be, the second from the right) there are tabs down along the left-hand side. Items shipped, artifacts found, minerals found, fish caught, etc. The bottom one is the secret notes.
