You can save ("download") a copy of anything that you find in the website, including instructions, commentary, etc. Just like a word-processing program, your browser has a menu called File, and a choice on it is "Save As."
1. Give the browser a location for saving the file (a directory on your computer)
2. Enter a name that you will recognize. (For details, check Converting Documents)
3. Choose "Save as Type" 
4. Start your word processing program and open the file from the correct location on your computer
Note that downloading in this way does not save images and some of the formatting may be messed up. However, most of the text will be there, and can be cleaned up. If you just want a paper copy of a web page, you don't need to download at all. Just use the "print" command on your browser.