I click on the gear at the top left of the Shortcut Box on the HUB. I want to add Auctions, but I can't figure out how to find the link that shows the number of active auctions.

Do you mean YOUR auctions? https://www.ebay.com/sch/i.html?_nkw=&_armrs=1&_from=&_ipg=&_ssn=somanypostcards&LH_Auction=1 Go to view items, click on the auction tab and copy the URL in the browser search box?