Registering horses here on our forum is easy, and also not mandatory by default (although some clubs or events may require it). You can head over to here to find registration areas for your horses, characters, and facilities. I suggest taking a look around at existing threads in these boards so you can get an idea of how it works. Also, when you create a new thread in these boards, a template is available that you can fill out to help get you started.
Welcome, welcome! Let us know if you have any other questions.