How do you edit configsys in dos?

To edit the config.sys file in DOS, you can use a text editor like EDIT or EDLIN. First, open the command prompt and type EDIT C:\CONFIG.SYS (replace C: with the appropriate drive letter if needed). Make your changes in the editor, then save and exit by pressing Alt + F, then select Save, and finally exit the editor. You may need to restart your computer for the changes to take effect.