ctrl+f? That is SO 1999. Get firefox and turn on the search as you type feature. You just start typing and it searches the page as you type. Single best feature of firefox.
After the site changed about a year ago, it became harder to do some of the things I used to do routinely. For user search, I now usually do it like this:
Click Forums Click Who's Online Click View Member Directory
Towards the top of that page, there's a text box called "Search for a user"
Incidentally, I saw this post because I searched for you (an old habit ), and selected "Show User's posts".