To delete a PDF file from your device, you can follow these steps:

1. Locate the PDF file: Go to the folder or location where the PDF file is saved on your device.

2. Select the file: Click on the PDF file to select it.

3. Delete the file: Right-click on the PDF file and select "Delete" or press the "Delete" key on your keyboard. A confirmation message may appear asking if you are sure you want to delete the file. Click "Yes" to confirm.

4. Empty the trash: If you have moved the PDF file to the trash or recycle bin, you will need to empty the trash to permanently delete the file from your device. Right-click on the trash or recycle bin icon and select "Empty Trash" or "Empty Recycle Bin". A confirmation message may appear asking if you are sure you want to permanently delete the files. Click "Yes" to confirm.

Note: Once you delete a PDF file, it cannot be retrieved unless you have a backup copy saved on another device or cloud storage.

In conclusion, deleting a PDF file is a simple process. Just locate the file, select and delete it, and empty the trash to permanently delete it from your device.