There are three possibilities to get your sources into the CVS repository:
If you don't have a CVS Repository yet, select first CVS Admin > Init CVS Repository. This will perform a
cvs init command to create initial CVS administrative files in the Repository.Watch the messages CVS produces in your shell. Now, your sources are in the CVS repository. If you only want to use the File related CVS commands, you are done; only if you want to use
cvs rtag and other purely module related commands, you need to define CVS modules.