How to use Immersive Handouts Bundle: Old-Style?

I just bought the Immersive Handouts Bundle: Old-Style. How can I use it in my games?

Go into your game, go to the Art Library tab, switch the search to "Everything", then search for "Old-Style" (without quotes). It will be there.  Alternately, some marketplace items can be downloaded. It looks like you can download the Immersive Handouts bundle items. 

Ok. I found them. How can I write on them?

I think they are just art images, you do what you would do with art images, use an art program of some kind to write on them. Hence downloading them. 

The page for the individual items in the bundle give potential workflows. Generally: Place the item on a page and use the Roll20 text tools to write on them (good for landing pages, campaign logs, etc.) Download the art and create a handout using an image editing program, then upload the composite image into a handout. Note: When doing this latter method, it is often a courtesy to provide the content of the handout in plain text in the notes section, for people who are impaired, use reader apps, or just have problems reading blackletter fonts. :) Example: