Open NFC support is mainly community-driven. Open NFC releases include already extensive documentation, please make sure you check first the documents provided in the archives, there is a good chance the answers to your questions are there already.
The next place to look for information is this website, by using the “search” feature in the menu. If you cannot find what you are looking for, please search the support mailing-list archives at this URL.
The mailing-list dedicated to support is: Open NFC Help. You can browse the archives or send a mail to the list. Please note that all traffic is moderated on this list, therefore some delay between your sending and the time the mail appears on the site is normal.
Beside the community-driven support, you may choose to register with us. Please check this page for more information. Registered users get priority on the software support.
Finally, it is possible to get a support contract for Open NFC. Please contact us at opennfc@insidefr.com for discussing the terms if you are interested.