It will show under "Purchased Products" on the EXPLORE tab within the app.
When you purchase a digital album or ClickMix from the website, it will automatically be available within the app. You don't need a subscription in order to access your purchases from within the app.
If you purchased a premixed album from the website, it will be under "Purchased Products" on the EXPLORE tab within the app. All you need to do is login with the same email address and password you used to make the purchase.
If you purchased a ClickMix, go to the MY MUSIC tab and you will find them under the CLICKMIXES tab.