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Go to Settings Permissions:
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Then click Add Authors:
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Next, type sarajwil@hotmail.com to invite me to your blog:
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When you're ready to send the invitation, click Invite.
I'll receive an email with a confirmation link. Once I accept the invitation, I'll send you email. The option to make me a blog admin will appear. Return to the Settings>Permissions tab to view these settings, they will look something like this:
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Click the grant admin privileges link next to my name. Please send me email when this is done so that I can get started updating your blog!