with above url you will be able to access to all your websites in dashboard. After that you can open any website admin area /dashboard of particular website.
if you want to open direct your website dashboard/admin area then type following url in browser
www.yourdomain.com/config
STEP 2
After clicking above url, Following screen will open
STEP 3
NOW THERE ARE 2 WAYS TO LOGIN WITH EMAIL ADRESS AND PASSWORD
OR
Continue WITH GOOGLE (This means if you have gmail account if not then CREATE ACCOUNT)
Continue WITH APPLE (Use your Apple ID to sign in to Squarespace)
Continue WITH FACEBOOK (SIGN IN with your FACEBOOK ID)
if you have no account yet, then you can create new account from url , you can check link in following screenshot
when you will click on create account following screen will open, here you can sign up with gmail account or with email id.
When you click on MORE OPTIONS THEN YOU CAN SIGN UP WITH APPLE AND FACEBOOK ALSO