If you click the magnifying glass in the search bar, it will take you to the most advanced options: https://boards.cruisecritic.com/search/
Now there are two ways you can search for posts by a member.
If you remember a key word from the post follow this path:(if you don't have a keyword jump to next option)
Use the CONTENT SEARCH tab
enter that key word above the search options
and click the plus sign next to search by author - start to type the member name and a list of members to choose from should start to form as you type - pick the correct member
click the SEARCH CONTENT button at the bottom of the box.
That should bring up a list of all posts by that member with your search term in it.
If you do not have a keyword but just want to see a member's posts:
Click over to the MEMBER SEARCH tab
Enter the Member Name or partial in the search box
Click SEARCH MEMBERS at the bottom
You will be given a list of members who match your search
Click FIND CONTENT below the member name to see their posts/threads/photos