There are two recommended ways to find your posts.
The best way is to go to a post you've made and click on your name. This will display a menu of options:
You can select Find more posts by xxxx
is the user name you clicked on (your user name in this case).
The second way to find posts you've made is to use the search feature and enter your user name as the search criteria.
Note: There may be a limit on the number of posts displayed (usually 500).