[Ethereum] Token supply and decimals / metamask

You need to give Metamask the address of the token itself, not the address of the contract that created the token, like you did. I made the same mistake myself.

Your ether balance is 0, which is insufficient to pay the fee for the transaction you're doing. All transactions in Ethereum require gas, and ether is used to pay for that gas. Transfer some ether into that account and try again. (You should need less than a dollar's worth of ether.)