Hi Paula,
To sign in on the new
D23 website you must create a new D23 login. (This login will be different from what is on
DisneyStore.com.)
Use this link to register.
https://d23.com/register/
You will need to use your First and Last name of your membership. Once you have registered, you can change the name attached to the account.
Your account number should be in your confirmation email.
Password must be at least 7 characters. Use uppercase, lowercase, and special characters (ex: !, @, #). I think you need to include one of each in your password. I failed miserably the first couple of times because I only had two out of the 3. So, I contacted Disney (which is where I got the bulk of these instructions

).
Good luck!