A few questions about UF

Hello,

I have setup the app and the connection is good. I have tried logging in with FB and it works fine for new users but not for users who already have WP accounts. I thought the setting in the screenshot would merge the profiles?

Im having trouble setting up the autopost to FB page feature, where is the documentation? I want to post to a FB page but I'm only given the option to post to a personal FB profile.