We updated Kitten Sale website post with a tutorial to use with MyEtherWallet, check it out : https://kittencoin.org/2017/12/sale

Important : make sure the gas limit is correctly set, or set it manually. We recommand to set 150000 gas limit.
Usually, around 70000 gas is used but don’t worry, all unused gas is not spend and is returned to you.

Meow 😺