how can I replace the login form (no the home banner) to SCLogin form or modal popup and also how can I change the content in the login key icon to reveal SCLogin fro JFBConnect.

Unfortunately that is not possible to replace that Easysocial login form to SCLogin form.
If you would like to disappear that login icon from the Easysocial toolbar, we can provide you some custom css code to hide it.
Then set your SSCLogin module display on the top right corner so user can login through this SCLogin module on any page at your site.

I selected/turned on JFBconnect integration, but no social login buttons are shown anywhere.

Can you update your correct site backend login credentials so we can better have a check? Because it look like you provided that password is incorrect.

admin url is mgtow.social/administrator and ftp domain is mgtow.social
Login is satexamb and password is stackideas for both

If you would like to disappear that login icon from the Easysocial toolbar, we can provide you some custom css code to hide it.

If we are making it disappear, can't we also replace it to load the modal popup? If you tell me which file and where this code is , I can try to create another copy and see if it can be done. Which means each time I upgrade the extension (toolbar plugin) I need to replace this code/file again. Correct?

Also is there a way to hide the whole Login Layout (or) REPLACE/hide the login FORM and register buttons? what file can I modify? I expected this form to show the JFBconnect's SClogin form after integration.

Hey there,

I am really sorry for the delay of this reply as it is a weekend for us here.

This is the file output that Easysocial toolbar and that login icon as well. JoomlaFolder/components/com_easysocial/themes/wireframe/toolbar/default.php , you can template override this file into your current template file directory JoomlaFolder/templates/YourCurrentTemplate/html/com_easysocial/toolbar/default.php , for those new folder you have to manually create it.

In this method, you do not need to replace the code again when you update to next release version.

Also is there a way to hide the whole Login Layout (or) REPLACE/hide the login FORM and register buttons? what file can I modify? I expected this form to show the JFBconnect's SClogin form after integration.

When you enabled this Jfbconnect integration setting from Easysocial, it will show this social button under the login form, I've help you enabled a few setting from Easysocial backend, it should display correctly now.

Backend > Easysocial > setting > users > registration > Allow New User Registrations - YES
Backend > Easysocial > setting > social > Facebook > Allow Registrations - YES
Backend > Easysocial > setting > social > Facebook > Use JFBConnect Buttons - YES