Tosin,
Can you explain exactly what's happening? When you click the "Login With Facebook" button, does the authentication pop up? Were you able register through Facebook? Is it only after registration the redirect doesn't work, or is it when logging in that it's not working? Where are you redirected to now, and what are the Returning and New User Redirection settings in JFBConnect?
Also, if you can include the URL of a page that isn't working that may help.
All the info above will help us provide the best solution to your problem. First though, we need to understand what is (or isn't) happening.
Thanks,
Alex