Once you specified the files you want to compile, the specman path to be used and so on, you should rebuild the project. In general, every time you change the .build configuration, you should rebuild.

In order to rebuild you click the Rebuild button .

While editing source files, a project is incrementally compiled as soon as you save, unless the menu option Project > Build Automatically is un-checked.

The building progress is reported in the Progress View. Depending on your configuration, you may also see detailed information in the Console View.