Many items on this website have Master Documents in Google that will require you to Make a Copy. Go to "File Menu" and choose "Make a Copy" to make your own editable version. 

Here is a short video tutorial: How to Make a Copy of a Google Doc (2:15)

If a content block below is not working properly, simply hover over the TOP RIGHT CORNER and click in the Icon to open a new window and access the documents from there.