After a long time a-looking, I found the credentials here that LWF uses
to publish widgets to the Lotus Mashups server. It was driving me
crazy, because I couldn't find them in the project or model, or in the
workspace directory ( I even resorted to searching the file system ).
In short, choose Window -> Preferences and, under, Lotus Widget Factory Designer, choose Widgets and complete the Mashups Server username and Mashups Server password fields.