posts disappeared

Unless the posts are from the last couple of months, you can't see them on your profile page. You might be able to find them by going to Search (top right) and putting your user name in the search box. Once you've hit return, you can refine the list by searching by author and putting your username there.

Or, you can go to your favorite search engine and put in this string:

site:apple.com habana

When you make a post, you will be subscribed to the post by turning the bell icon on the right of the screen blue. All your posts that you are subscribed to will show in your profile under "My Subscriptions". If you click the bell and just make it an outline, then you will no longer find those posts under your subscriptions. There is not a separate tab for your posts. You will just want to make sure you stay subscribed to your posts that you want to follow.