You can join a private tracker, usually, only by invitation form a member. Many private trackers also have a maximum number of users so you can join only when there is a open “season” for joining.
There are some private trackers, though, with bigger communities which more or less regularly open the site (for a limited period - a few days at most) for joining or make available registrations slots as soon as other members get kicked out (for various reasons).
Use a search engine to find lists of the most well-known ones. Then, you’ll have to check in regularly to “hunt” for a available registration slot on some of them. Or alternatively, make friends with someone who is already on a private tracker which uses invitations.
Thank you so much for posting an immediate reply, greywizard. appreciate it. My apologies for posting in the wrong section. Will try to find trackers who can accommodate me.