Cannot change information once wizard has finished

I am playing around with the Web-components in WDSCi. I have tried to 
define a simple Web Interaction by using the wizard that can be invoked 
from the toolbar. However, when defining the service program procedure and 
its parameters, I seem to have made a mistake. I want to fix this, but I 
cannot find a way to change this information. Do I have to dig into all 
the files that have been created by the wizard and fix things manually? Or 
can I get back to the point where I did enter the parameters? I think it 
would be a strange thing if I had to start the wizard all over again, just 
because I did make some mistake along the way.

(Maybe I should use a Properties-option on one of the files that have been 
generated, but there are just so many files. I feel at a loss.)

Any help would be greatly appreciated.

Ewout