Sorry for the inconvenience. Blogger made some updates, in part as a result of being bought some months ago by Google, and offered the owner of this blog to migrate to the new system.
Therefore, you will have to change your sign in to your Google account information. If you don't have a Google account, you will have to set one up. It was very easy for me to do. I hope it is for you too. If you have trouble, ask someone in your household to help you. You can do it, I know you can.