Open 2 browsers - B1 with email 1 and B2 with email 2
In B1, sign into your current Blogger account
Invite email 2 as author
In B2, sign into email 2 and accept invitation
Go back to B1 and make email 2 admin
Go back to B2 and make sure email 2 is author and admin
Then if you wish, remove email 1 as author and/or admin
Sign up here with your email
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