Purchase ZOOM Tokens with USD
From the web app click on the Tab on top that says: ZOOM
After you click ZOOM, you will get the Order Entry box:
Just type in the amount of ZOOM you want to Buy, and click Buy.
If you are on the iPhone app, just go to the home screen and click on ZOOM Tokens. That will take you to the page for purchasing ZOOM.
Purchase ZOOM Tokens with BTC or USDT
In the Market Watch, click the "BTC" or "USDT" tab and then choose ZOOM/BTC or ZOOM/USDT
Enter the amount of ZOOM Tokens you want to purchase with BTC or USDT.
Make sure the number is correct, click the "Buy ZOOM" to make your purchase.
Purchase ZOOM Tokens with other currencies
For example, if you want to buy ZOOM Tokens with ETH, you will need to trade ETH --> USD, BTC, or USDT and then trade that for ZOOM Tokens by following the above instructions. For more information on how to trade, see How do I buy/trade digital currency?