Move your cursor over Interests at the top of your homepage and select Companies. Click the Company Page you want to edit from the Manage your pages section on the right. Click the blue Edit button in the upper right. Scroll down the Overview page and find the Company Pages Admins section on the left. This is below the Company Description and Default Language fields. Under Designated Admins, start typing the name of a connection that you want to be an admin. You must be connected to the new admins through LinkedIn before you can add them. Click Publish in the top right of the page.