Having the same issue.
Did you figure it out?
I think so, if you click Editions under MtG Database (left hand side near the top) from there scroll down past all the core sets and and expansions until on the right hand side you will find Extras - Tokens, Emblems. Find the correct set, the specific card, click on to open the card information page, under the picture of the card it has Inventory/Trade List Edit, click that and add your quantity.
Hope that makes sense, my head is in the shed at the moment so it seems fine to me but might be very badly explained Good luck!
Take care Dalfort.