Glad to hear you're getting through it. JFBConnect, we think, is relatively easy to install if you've installed other extensions.. but it can definitely be complex. Hopefully, for your first extension, it's not too bad. Certainly if you have any suggestions on how to improve things, let us know!
Basically, those tags on that page can be added anywhere on your site that content is displayed. So, for example, if you wanted you could create a "Custom HTML" module. This module lets you put HTML directly onto the page. So, once that's created, you can simply add { JFBCLike} (no space) to the content area of the module and it will appear wherever you put that module. You can also add the {} tags to your Joomla template or other 'coded' places on your site, but I'd recommend just starting the Custom HTML approach for now.. it's the simplest way to start.
Please note, that all of the {} tags also have a module that you oould simply use instead. For example, you could use the JFBCLike, JFBComments, or other modules to simply insert these widgets wherever you want.
Hope this helps explain. The {} tags are a bit more advanced, but give you the flexibility to add the widgets in non-standard (non-module) positions on the site.
If you have any other questions, just let us know. If anything in Joomla's confusing you as well, don't hesitate to ask. We don't mind generic 'how do you do this' questions
Good luck!