Shft+A brings up the Toggle texture application, there you can select a texture, fill in the scale, offset and angle, and then apply this texture with it's settings to a face by right-clicking on it. You can select faces with the left mouse-button, and perform certain actions on it's texture, like fit to face, or fit to top, or center, and so on.
This application is also accessible trough the left sidebar, it's the button with the colored box.
Oh, and get Hammer 3.4 or 3.5 beta, it's the most recent version of Worldcraft.