Instructions for Using Craft "Embedded Assets" Plug-in?
Author of EA here. Adding in that extraAllowedFileExtensions config setting is about all you need to do. Any other configuration is just for "power" users (for lack of a better term) and you shouldn't need to worry about them.

There's many reasons why you might not be seeing anything show up in your templates. You also said it sometimes breaks the page altogether? Can you please elaborate on this? Are you running in dev mode? If there are any errors, what are they?

It might be better for you to post this as an issue on the Github page, so it can be more of a discussion. I don't really have an answer for you as I don't yet know what the cause of the problem is.