To buy on Binance through YEN, you will need to have some Bitcoin in your Binance account.
An easy way to do this is deposit some Bitcoin over from Coinbase to Binance.
Step 1: Login to Coinbase's website: www.coinbase.com
Step 2:Find your Binance’s BTC deposit address (https://www.binance.com/userCenter/deposit.html) and place it into Coinbase's BTC withdrawal address field. Input the withdrawal amount you would like to send and click Continue.
Step 3:Check the status of your deposit by going back to Binance’s Official Website. Click 【Funds】→【Deposits】. Confirm to make sure your transaction has gone through by looking at the transaction history.
Step 4: Once your Bitcoin is sent over to your Binance account, you're ready to make a purchase on YEN. Head over to your YEN account and click the Buy/Sell button, select Binance in the window, select the cryptocurrency you would like to purchase and click Buy.
Step 4: Once your purchase has gone through it will be announced throughout YEN globally! Congratulations, you just made your purchase on YEN!