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Right-click (or hold down the Ctrl key on your keyboard and click) the name of the account in the left-side column and then select Sharing Permissions...
Click Add User... and select the person to whom you wish to grant access.
Highlight the user in the list and grant a permission level such as Publishing Editor. Other types of permission can be granted as appropriate, but Folder Visible is mandatory.
Click OK.
Allow access to additional areas of the account individually by selecting them and repeating steps 2 through 4.
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