Create a plain text file named `dosbox-x.conf`
Open the file in a text editor
Add DOSBox-X settings in `key=value` format
Save the file with UTF-8 or ASCII encoding
Place the file in the DOSBox-X config folder or any location you prefer
Start DOSBox-X with the config file using `dosbox-x -conf dosbox-x.conf`
Use `dosbox-x.conf` to set options such as `memsize`, `fullscreen`, `cycles`, `machine`, and `mount`
Keep each setting on its own line
Use `#` at the start of a line for comments
Use `[` and `]` section headers when needed
Verify the file name and path are correct
Test the config file by launching DOSBox-X with it
Edit and save changes as needed