its your responsible to find and choose.
You can join a coven by going this link.
there are several coven that u can join,
click a coven that you want, and click the join or accepting application.
After that u must send requirements to the priest/priestess, of the coven u chose, and wait till u accepted,or rejected.
Thanks that helped a lot. I was wodering about the immortals ceep what type of magic should I study to join because I practis alteration spells(transformation) and if not what coven would be great for me?
Transformation Magick to begin with doesn't exist , and to finish immortals keep accept anyone who is mature , kind , caring , a team player and someone who likes to learn .
If you need more intonation it might a good idea to ask the priest and priestess about the coven , so you have a good picture about what the coven is and stands for .