Search in Users
General Options -> User Search
The plugin provides a highly configurable user search engine as well.
Searching simple user fields
To search Login, Display, Firs, Last names or user Bio (description), use the following settings on the User Search options panel:
If you want to exclude a group of users (typically administrators) from the results, then use the User roles exclude option:
Displaying user Images
The plugin will automatically try to display the default user images, but if you wish not displaying user images, or you want to display the BBPress user avatars instead, use the Display user images? and the Image Source opions: