I didn't know there was a registration form but even if there is it might be old (before seekersguidance used to charge fees, now they don't through their new "knowledge without barriers" project). The amount of interaction with teacher varies from the course type. In a Qur'anic course you will have live sessions every week inshaa Allah and a few recordings or sometimes the same amount of recordings. In more theoritical subjects like hadith, you have more recordings than live sessions. I believe you can see your teacher in the live session, you can ask them questions live or you can use the seekers forum to interact with your teacher. The teacher usually also makes their email available. In Qur'anic live lessons this interaction is vital, in others it isn't as vital, although you still have an opportunity to forward your questions and clear your doubts if need be. Mashaa Allah, I think they provide such quality education for free. Especially the Tajweed courses.