Answer
First you need to sell your BTC into USDT and get that 62 USDT. To do this you can click on the market, find BTC/USDT, choose manual , and then sell the btc into usdt there manually.
After you get the USDT , you can go to MBTC/USDT pair and click Create Bot. MBTC/USDT minimum requirement is way lower than BTC/USDT so you can start the bot with 62$