Edit site settings
Navigate to the site settings page.
Select Authors > Add Author
Navigate to the site you to which you want to add the author. Then click 1) Authors, 2) Add Author

Add author
- Select Add for the authors that you want to add and then select Close.
- If the author has not yet been added to your account, you can select Invite new author.

Set permissions
See here for a description of the different authoring permissions:
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