How do you allow people/tell people how to post on a pub group as their business page?

Hi, I'm trying to find out how you allow people to post to a public group, as their business page. If this is something that has to be done on the user end only, I would then need to know the instructions to tell people how to post on a pub group as their business page.

Thanks!

 

This sound like something that has to be done from a business page by a person who has the role of admin or something similar. Posting in groups ususally happens from a personal profile but if the public group has been created by the same business page, they might be able to post something under their official handle.

 

We've looked, and it is set in settings to allow posting as a page, but when you join there is no option to join as your business page and we don't know why. There also isn't a spot at the top to set "interacting as..." I've joined another group and can interact as my page but we can't figure it out on this group. Also the group I can interact as my page is exactly the same as this one. Public, visible, general. We're stumped.