How to change this in a Facebook Page?

[Hannah Adeza]

http://grabbingchances.tumblr.com/post/5...oo-answers <-- Please open this this is the photo that I want to ask

I keep on seeing this (the one with the red box on the photo) whenever i go to that Facebook page.
How can I change that? Is there an option for that? How can post as the name of the page and not my name on Facebook?
I'm an admin there but I don't own the page.
I never posted anything because I'm new to that page.

Can you help me please?
(Sorry if my English is bad, I'm not an American)

[Avasyu]

I did a spell and grammar check and found no errors. Your english is quite good