I have a contract for a token. I have successfully sent ether to my contract address. I can access my contract and get my balance, but when I try to send ether from my contract address to a different address I am asked for a password to unlock the contract address. Trouble is I don't ever remember setting a password for the contract address. I presumed that the pw might just be the same as my  account, but it's not. Do I need to first set a password to unlock my contract. How do I do that?