To commit changes either right-click on the desired folder and/or files.

Select CVS Commit... from the context-menu.

The Commit Dialog will appear, which will allow you to enter a comment for the commit action. Additionally, you can choose which changes to commit by checking the individual files on the dialog list.

Click OK (or press Ctrl-Enter) once you have entered the appropriate comments and selected the changes to commit.

The Progress Dialog will appear to provide a detail status of the committing process performed by TortoiseCVS. By default this dialog will close after the operation is complete, unless it encounters a problem.