If you are uncertain about the exact spelling of the user's username, enter as much as you are sure of followed by an asterisk (*).
For instance, if you didn't remember whether I was "LadyFingers" or "Lady Fingers", you could enter "Lady*" while entering "Lady" without the asterisk would only get the member with that exact username.
There are a lot of members, so narrrow your search as much as you can.
Oh, and Grelo, Shortcuts is one of the boxes of options on the right of this, and every, screen here. Above the Unanswered Posts and Active Posts boxes. If you have your text size large here, you may need to scroll to the right to see them.