On the module's main page, click on the User Access Control icon. This will take you to a form listing users who currently have read and write access.

To give read-only access to only a few users and read-write to the rest, select the Listed users are read-only radio button. Then, enter the names of those users who should not be able to write to the repository into the left-hand text box provided. On the right, the option All users can write should be selected.

Alternately, to give read-write access to a few users and read-only to everyone else, select Only listed users can write. Then, enter the names of those users who will be able to write to the CVS repository into the right-hand text box. On the left, No read-only users should be selected.

There is not much point entering usernames into both boxes, as any user who is in both lists will be given read-only access.

Click the Save button to make your changes immediately active and return to the module's main page.