The "Login using Facebook" text is defined in the language file, so you could change it there to be blank:
.../language/en-GB/en-GB.mod_jfbclogin.ini
Or override/modify the template:
.../modules/mod_jfbclogin/tmpl/default.php
Let me know if you need more help.
how to remove "Login using Facebook" from jfbconnect
