1Yes, you can select the pages to which you need to publish after authorizing facebook application.
For this first enter the application id and application secret in the settings page.
After adding these values click the save button.
Now you can see the authorize button in the page as given below.
Now click on the Authorize button.
It will authorize the facebook account and display all pages related to the account. See the following image for this option.
Here select the page where you want to display the posts and click on the “Save” button.
Now it is ready to post to the selected page/pages.
In the premium plugin you can use the re authenticate button to reauthorize the app.