To incorporate a PDF file into your Wix website, begin by logging in to your Wix.com account and accessing your site. Next, click on 'My Sites' and select 'Edit Site' to enter the site editor. Within the editor, locate the 'Media' section and click on it. You'll find an 'Upload Media' icon; click on this to initiate the file upload process. From there, you can select and upload the desired PDF file(s) directly from your computer to integrate them seamlessly into your Wix website.