On the page you would like to post your Facebook link, click 'Edit Page' and then put your cursor where you would like to post the link.
Click the 'Image' button.
A pop-up appears. Click 'Select Image.'
Another pop-up appears. Click 'Browse...'
Select the Facebook file you just saved and then click 'Add Image(s)'.
The pop-up closes. Click 'OK.'
Your logo now appears on your page. To link the image to your Facebook page, go to your Facebook page in another window (i.e. don't close the window that you just posted your Facebook logo on) and copy (highlight, press CTRL+C) the web address. It will look like www.facebook.com/company or http://www.facebook.com/pages/company/121380247905072.
Go back to your page where you posted the Facebook logo. Highlight your logo and click on the 'Link' button.
Paste in your Facebook web address (press CTRL+V) under 'URL' and then click 'OK.'