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you should be able to just click ctrl D when you are on the page to add facebook to the favorites
i would have to see the quick sign in bar to tell you how to add it to that. usually you can just drag and drop to them but i would have to see it to do it for you and show you how to do it in the future.
i am able to get you my phone number and log in remotely to do it with you but there is an extra charge.