Binh,
I just tried to check your page, and was getting a 404 error. Has it moved somewhere that we can see the current behavior?
For the JFBCLogin module, to adjust the height/width, you can either add some styles to change the font-sizes or remove some margin to the Login module itself. We can help you with this, but would need to see the page. The other alternative is to create a new login module template, and there you can modify the looks of the login box as much as you want. You can create a Template Override to do this easily, just check out the instructions on the page below:
www.sourcecoast.com/extensions/troublesh...ng-joomla-extensions
I'll try to figure out how to do the Agora code, but I'd really recommend posting that question in the Agora forums to say "I need to add code 'here', what template file is that in". Once you get that, you should simply be able to add {JFBCLike} to wherever they tell you to put it.
It may take us a little bit of time to figure it out ourselves.
Thanks,
Alex