Adobe Acrobat Reader is a free program for viewing and printing PDF files.
In this description, we'll walk through the process using for Windows; presumably MacOS is similar.
In general, the text that the computer outputs will be in italics and the text that you type will be in bold.
First, pop up your web browser.
Point your browser to
Find the link labeled Get Acrobat Reader. Click it.
When that page loads,
you'll see several options at the left side of the page.
Click on Get Adobe Reader.
It may pop up a window telling you that your form submission is insecure. That's okay; click on Continue (or whatever the appropriate button is).
After a little while, it'll pop up a window asking you where on your computer to store Adobe Acrobat Reader. In Windows, probably the best place is your desktop.
Wait patiently for Adobe Acrobat Reader to download. It may take a while.
When it's done downloading, double click on the icon for the newly downloaded file and let it walk you through the installation process.
To test this, go to the class content page and click on a PDF link. It should pop up the PDF document inside a PDF reader (which may appear inside your browser window).