I can see you're using Joomla 1.5. The best suggestion I have is to make sure you got the Joomla 1.5 version of JFBConnect. Currently, the version for the Joomla 1.5 version is v3.2.1. The filename should look like:
com_jfbconnect_j1.5_v3.2.1
If that's correct, let us know, and we'll help you with some other suggestions that will hopefully get you setup.
Thanks!