As a small to medium sized business, you more than likely created your own LinkedIn company page and are the sole user of the page. After hiring a social media manager or agency to manage your company page, you'll need to add the new hire as an admin to allow them to post on your behalf.
Here are the steps to add a new admin to your LinkedIn company page.
The new company page admin will receive a notification to accept the role of a page admin. Once this is completed, the new user will be able to edit, publish posts, and manage your LinkedIn company page.