Replace Joomla Core Login with JFBCLogin

The best, easiest, and 'right' way to do that is to create a template override for the core Joomla login page. To do so, you'd simply copy
/components/com_user/views/login/tmpl/default_login.php
to
/templates/<YOUR_TEMPLATE>/html/com_user/login/default_login.php

Then, edit the copied file, which has Joomla's normal login. Here, you can remove the existing form, add your own "Welcome" text, and then add {JFBCLogin} whereever you want the Login With Facebook button to appear.

This is the best way because it won't be destroyed when you upgrade Joomla and all "You must be logged in to .." pages redirect to this page, so you should be covered.

Hope this helps, and good luck!

No problem. It's what we do

Hope that got you fixed up nicely, but if you need anything else, just let us know. After you've used JFBConnect for a bit, please consider leaving a rating and review on the Joomla Extension Directory:
extensions.joomla.org/extensions/social-...ook-integration/7215

Best of luck to you,
Alex

Yes, if you want to add the Login With Facebook button to the standard Joomla login page, the instructions above would work for you. If not, let us know, but I think the file names for the main com_user component are the same in 1.5 and 1.6.

As for the redirect when the user logs in from that page, if you have the "Enable Returning User Redirection" set to 'no', they'd be left on the same page. Joomla, however, will change it to show that the user is logged in and provide a logout button for them.. so while not necessarily where you want them to be, it won't be confusing either by showing them another login form and making them unsure if they really had just logged in.

Hope that helps, and good luck,
Alex

No problem. Your subscription allows us to provide our high level of support, so thank you!

Finally, please consider leaving a review on the Joomla Extension Directory for JFBConnect and our support. It's certainly not required, but very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Should you need anything else, just let us know, and good luck,
Alex