Facebook – How to add a Apply For Job button with links and photos to Facebook Page

Depends what you mean by post to walls. If you really want if showing on their wall so that they and all their friends see it then yes you need an application. This might be annoying to all your users friends and they can block you. If you just have a page updates you post to the page will show up on the home screen (not profile) of your fans. Remember not everything on facebook shows up it's like SEO you have to do FBO

Try https://www.facebook.com/notes.php?id=[YOUR_PAGE_ID]

Or type Notes at the top then search on the left for your Page.

Or go to your Page and click "Use Facebook as [PAGE NAME]" then click Notes

If none of these work then I would contact support.