pull something off the internet
to "pull something off the internet" is just to say that you found something on the internet. It can also imply that you downloaded that thing. In this case, it sounds like this person downloaded an instruction manual.
In this case "manual" is noun. See https://en.wiktionary.org/wiki/manual#Noun
It is a handbook, often meaning the booklet of instructions that comes with a new device. It is usually possible to find on the Internet a PDF file with the contents of a manual, which is very handy if the original was lost.