sifnoded tx staking edit-validator [flags]):
sifnoded tx staking edit-validator --chain-id="sifchain-1" --gas-prices="0.5rowan" --commission-rate="0.1" --details="<description of your>" --website="<website address>" --moniker="<validator name>" --from="<address>" --identity="<keybase public key>" --node=tcp://rpc.sifchain.finance:80
--help
) to see additional flags that can be set.