How to post on another facebook page as my facebook page not as a person?

[Thomas]

I want to post on a facebook page as my facebook but but not do any that tagging stuff etc

[Zeeshan]

There is two things:
1. you are an admin of the page, whatever you post on the page it will be posted as facebook page
2. you are not an admin, but still you can post any message on the wall as it is from a page.

To do the 2nd option you need to click on the "setting/use facebook as" icon from the top right beside your name. Then select any page. after that whatever you post in other pages it will be posted from the page that you have selected.