You access WebDir as a user from client machine just like you access any website hosted on your local network.
The address of the WebDir machine is usually the name of the machine. For example, if the name of the machine where WebDir is installed is WebDir4pc, then you will type the following URL in the web browser of the client machine:
http://webdir4pc/
This will take the user to the default login page of WebDir.
Make sure there is connectivity between the WebDir machine and the client machine before accessing WebDir's user interface.