You may see a 'Insufficient Balance' when trying to register a name.
Possible reasons for this are:
the connected wallet is different the one you intended
you're holding ETH on another chain (e.g. Base), and not on Ethereum mainnet
you need slightly more ETH to cover possible price fluctuations
Solution:
Check your connected wallet is the correct one
Check you have ETH on Ethereum Mainnet
Top up you wallet with more ETH
Registration, renewal and gas fees are paid in ETH on the Ethereum mainnet.