You can post as a company page using AuthoredUp similar to how you do it using base LinkedIn: when writing a post, switch posting Actor to a company account you control.
Here's how.
1. Click the Actor button in the LinkedIn bar at the bottom.

2. Click Acting as...
3. You will see standard LinkedIn post options popup. Click the Actor at the top.

4. Click on the company you want to post as. Then click Save.

5. Click Done.

6. The LinkedIn toolbar should now indicate you are posting as a company page.

Simpler and faster way
You can also activate the company posting mode by going to your company page.
Select Create from the menu on the left.

Choose Start a post.

AuthoredUp should open up with your company page already pre-selected.
