The general way to find the list of your Posts is to click your Profile in the top right of the screen
which brings you to this page.
Then if you click Forum Settings Edit it will bring you to this page
where you can click Show Posts to see a list of all your Posts
If you can find a Topic which already contains one of your Posts then a quicker way to get to the Show Posts page is to click your username
And to save time in future ...
When you have found the page with your list of Posts it is probably a good idea to bookmark it
Bookmarking individual items is also useful
If you have a lot of posts finding the list of them may not actually be very helpful for finding anything except the most recent Posts. I always bookmark any Topic that I create and also any other Topic or Post that I think may be useful in the future.