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Either post in it, and then you can search for threads you've posted in, or you can subscribe to a thread, but clicking the dropdown menu at the top of the first post in any page of a thread. Thread Tools > Subscribe to this thread. Or just make a bookmark in your browser. I do all three.
If you go to My IC > Edit Options, under the second sub-heading 'Messaging & Notification' there is an option called 'Default Thread Subscription Mode' which has a list of default subscription options, I personally use the 'No e-mail notification' option which automatically subscribes any thread you post in so they appear in your control panel when new posts are added but doesn't fill up your e-mail with notifications
Also, you should be able to find all the threads you have posted in with the most currently active ones at the top of the list by clicking on User Menu > My Active Threads