I used to have myetherwallet adress and i never list the password of myetherwallet in my notepad,only the eth account adress and the private keys which i think this are only the important to save.
AFAIK you don't need any password if you are importing a wallet via privatekey. Perhaps you are opening your wallet with a Keystore / JSON File?
My question is?
Is myetherwallet password is important when i need it to exchange my rewards into fiat?or only the eth account and private keys?
Hope you mates can help me clear this out.
Your password is ofcourse important if you are opening an encrypted wallet like what I mentioned via Keystore / JSON File. You will not be able to access your wallet without it. As for trading your coins with fiat, it will not require you to input your password when transferring your coins to an exchange. Just enough coins and eth to cover for the gas fee.