Adding/Modifying FA

Access to menu option is controlled via access roles setup. First you have to select some security area for the new menu option. If you want the option to be available for all users you can use SA_OPEN. Use the code you have selected as forth parameter in add_rapp_function/add_lapp_function call in respective class. Also put $page_security='SA_xxxx' at the top of your new option page.
If you have selected standard security area code other than SA_OPEN you have to enable related area in your role setup.

Adding non-standard security area code is more complex. You can download some FA extension to have example of this.
Janusz