How to create an access token?

I am a bit confused about the facebook graph api and access tokens.

I have created a facebook user and a facebook page. Now I want to write an application that lets the user post a message on the pages wall/feed. As far as I understand it right now I need an access token of the user to post a message to the pages wall. To create that I need an app id and app secret. But there is no ap开发者_开发问答p, there is just the page and the feed. Do I have to create an app? And how would I connect the app to the page without creating a new tab on that page?

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In order to do anything whilst acting as a user, you're going to need an App and the correct permissions from the User. Read more about Authentication here