Similar to Ethereum and other networks, Moonriver network requires $MOVR token in order to do transactions on the network. You can obtain $MOVR from the Solarbeam faucet upon using the bridge, or you can obtain them from supported exchanges.
You can manually configure your wallet, by adding Moonriver network with the following settings:
MOVR - Mainnet
New RPC URL:
Chain ID (optional):
Block Explorer URL:
After you've opened the Network tab, scroll down and click "Custom RPC"
Fill in the details with the Moonriver settings (at the top of this page).