If you are looking to import and edit STL files in Blender for 3D modeling and printing, here are the steps you can follow:

1. Open Blender: Launch Blender on your computer to start the process.

2. Import STL file: Go to File > Import > STL and navigate to the location of the STL file you want to open. Select the file and click 'Import' to bring it into Blender.

3. Edit the STL file: Once the STL file is imported, you can begin editing it within Blender. You can use Blender's wide range of modeling and sculpting tools to modify the design as per your requirements.

4. Prepare for 3D printing: If your intention is to 3D print the model, you can prepare it for printing within Blender. This may involve checking for any errors in the model, setting the proper scale and orientation, and exporting it in a format compatible with your 3D printer.

By following these steps, you can easily open, edit, and prepare STL files in Blender for various purposes, including 3D modeling and 3D printing projects.