At the top of your Lobby Screen, you’ll see your Token count (how many Tokens you have left). Tapping on the "+" sign will lead you to a page where you can purchase more Tokens. You’ll be able to buy packs of Tokens, from 20 to 3,500!
Alternatively, you can also reach the same screen through your RECHARGE tab. At the top of that screen you'll see a carousel of the same Token packs that you can scroll through and tap on to purchase.
Once you’ve paid for your Tokens, you can pick them up from your COLLECT tab. You’ll be able to see this recorded in your Game Log as “Purchased Tokens”.