Go to the Coin page for the coin you want to purchase.
Type the amount in USD value that you want to purchase of the selected Coin.
Click Next in the confirmation step. (The "Make username public" option is only used for alerts if they Creator uses an alert system like Streamlabs or Stream Elements.)
You are presented with two options from which to choose:
Pay with Coinbase: Click this option to connect to your Coinbase.com account to convert cryptocurrency you hold there to the selected Coin.
Or, select a cryptocurrency: Click one of the listed cryptocurrencies to connect to your Ethereum wallet, such as MetaMask or Coinbase Wallet, where you hold the selected cryptocurrency.
Complete the transaction.
If paying with cryptocurrency, ensure you have the respective network's main currency to cover transaction fees associated with sending currency/tokens.
Do not send BEP20 tokens (Binance Chain) to the Ethereum payment portal options (ETH, USDC, etc.). Only ETH and ERC20-USDC transactions can be received by the ETH and USDC payment portal. These payments must be made from a wallet on the Ethereum Mainnet.
Buying a Coin with $RLY (aka Convert)
You must have $RLY in your Rally.io Portfolio to use the Convert feature.
If you have $RLY in an Ethereum wallet, you will need to use the Bridge In feature to first move the $RLY to your Rally.io account. See this article on using Bridge In.
If you have $RLY in your Coinbase.com account, you will first need to move that $RLY to an Ethereum wallet, such as MetaMask or Coinbase Wallet, and then use Bridge In.