This morning you should have received an email from "Saul Baizman" with the subject "You have been invited to contribute to Saul Baizman's blog."
Plug the special link contained in the email into a web browser. You'll be directed to a login page on the Blogger website:
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Since Google owns Blogger, you'll need a Google account to access the site. If you don't have a Google account, click "Create your account now":
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Fill out the Create a Google Account form:
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Click the orange "Continue" arrow to complete your registration.