These are the easiest for beginners. Options include Bitbank (highest volume for MONA/JPY), CoinEx (supports MONA/USDT and MONA/BTC), and Zaif .
Create an account on your chosen platform and complete the Identity Verification (KYC) process. Deposit Funds: how to buy monacoin
MonaCoin is primarily listed on exchanges that serve the Japanese market or specialized altcoin platforms. These are the easiest for beginners
Use a bank transfer or credit/debit card to deposit JPY or USD. CoinEx (supports MONA/USDT and MONA/BTC)