Purchased Tokens will appear in your Inventory, but can only be activated in your Kanrik Chronicles Hub Page. There is no extra step to activate them within your Inventory, you can go straight from the NC Mall to Kanrik Chronicles if you want to use them right away. Tokens can also be purchased directly from the Kanrik Chronicles Hub Page by clicking on the image of whichever Token you wish to buy.
From the Hub Page, if you wish to use any Token you can do so by pressing the Use button underneath the corresponding Token at the bottom of the page. If you have no Tokens, there will be a Buy button instead of a Use button.