There are a number of ways you can use PDFs on your Locable website however it's important to note that PDFs are not very web friendly - they don't help with SEO (Search Engine Optimization), they don't work well on mobile, and they're not easily searchable.
That said, if you need to use PDFs it's quite easy to do.
Start by uploading your PDF by clicking Manage Content > Media Manager > click the New PDF tab and browse your computer to upload.
Once uploaded, you can use the PDF by clicking Copy URL.
This URL can be added to any page, content etc as a link.