To buy crypto instantly, there are to ways to fund your wallet. You can read up more about that here.
After funding your wallet:
∙ Click buy crypto from the home screen
∙ Select the cryptocurrency you wish to purchase (Bitcoin, Ethereum, Litecoin, USDT or Tron)
∙ Enter the amount
∙ Select your preferred payment method (cash wallet or debit card)
∙ Follow the prompts to complete your transaction.