The short answer is that you can't through the forums themselves. We have to limit the search results returned for all searches, as it's a server-intensive job. And if we increase it for one kind of search (like for all your posts), it's increased for all searches. Unfortunately, that's a limitation of the software we use.

The long answer is that you can using Google with a query like this:

site:forums.psychcentral.com docjohn 2004

Change out "docjohn" with your own username and the year with the year you'd like to search on your posts. This will also display posts/threads where your name is mentioned, but it's a pretty good search alternative nonetheless.

Best,
DocJohn