"The "cvstest" is a test-repository, please use this for learning CVS, then switch to the official repository "cvsroot".
Select OK and you should be prompted for the password, which is the same as for OPENCORES.ORG web.
This is your first communication with the CVS server. You should see a message ending with "*****CVS exited normally with code 0*****". If you see CVS exited with a different error code than something went wrong, doublecheck your preferences and password.
Import
Copy all your files in some folder on your local drive (example: c:\cvs_import). In WinCVS change browser location to that folder. You can change it under 'View' - > 'Browser location' -> 'Change'.
To import your project, choose "Import Module..." from the "Remote" menu. Window "Import settings" will show up. Type name of your project (it is case sensitive) in the "Module name" filed and click "OK". After import is finished all your files are on OpenCores CVS.
Checkout
OPENCORES.ORG hosts a lot of different projects. You are interested in your project. To checkout your project, choose "Checkout Module..." from the "Remote" menu. Window "Checkout settings" will show up. Type name of your project in the "Module and path" filed and click "OK".
You'll see WinCVS downloading your project folder (which is empty if you are doing this first time). When it is done you won't see all the files. Press F5 or Reload the Browser view.
Add and commit
If you will add some files into your CVSROOT folder on your local drive or if you will change them WinCVS will autmatically recognize changes. To add new file/folder to CVS server select it and choose "Add selection" from "Modify" menu. Then choose "Commit..." from "Modify" menu and wait for WinCVS to finish operation.