# Editing the default `sum.ini` file

Procedure

1. Navigate to the temp directory for SUM. The default location for the temp directory is `/var/tmp/sum` (Linux) or `%LOCALAPPDATA%\sum` (Windows).
   NOTE:

   If there is no directory or `sum.ini` file, launch SUM, and then shut down the application to create the default `sum.ini` file.

2. Open the `sum.ini` file in a text editor.
3. Edit the parameters you want to change.
4. Save the file.
5. You can launch SUM and use these parameters.