While signed into your LinkedIn profile, you will have the following menu at the top screen.
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Click the “Advertise” button at the right end of the menu.
You will get a list of ad accounts that you manage, click the one that you want to manage.
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Once in the ad account screen of your choosing, there will be a menu on the left side, under the “Account Settings” item, click “Manage Access”
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On this screen, you will see all existing users that have access to your ad campaign
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Adding A New Admin
On this Manage Access screen, click the “Add User” button
A pop-up window will open for you to type the name of the person you would like to add.
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Once you see the person you would like to add, click their name from the list.
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Now choose what type of access you want them to have:
Account manager: The user can control account settings, access the billing center, download account reports, add and edit campaigns (status, bid, budget), and add and edit ads (headline, image & copy).
Campaign manager: The user can add and edit campaigns (status, bid, budget) and ads (headline, image & copy).
Creative manager: The user can add and edit ads (headline, image & copy).
Viewer: The user can view campaigns and ads.
Billing Admin: Billing Admins can change billing details on the account, view account billing history, and print payment receipts.
Once you have chosen the access, click “Add”