Company Page admins can edit the Company Page and post company updates at any time. Keep in mind that you must be a Company Page administrator in order to add or remove other admins.

Adding admins to your Company Page

To add an admin to your Company Page:

1. Click the Me icon at the top of your LinkedIn homepage.
2. Below Manage, select your Company Page.
3. Click on Admin Tools at the top of the page and click Manage Admins.
4. Click on the type of admin you want to add at the top of the page (Designated Admin, Recruiting Poster, or Direct Sponsored Content Poster). Learn more about the roles of each Company Page admin.
5. Start typing the person’s name you want to add in the text box.
6. Click Save.

Source: Linkedin