Once you install the scripts, the following two new items are available in InDesign
In the Main Manu Bar for InDesign you will see a new entry named Markzware. Under this menu will be an item named Convert PDF Document…
Clicking on Convert PDF Document… will bring a window where you can choose a PDF document to convert to InDesign. Once the conversion is complete you will now have a new InDesign document that you can edit and make changes too. Please remember to Save your InDesign document before doing too many changes to it.
Under the File Menu a new item will appear named Open PDF File… This will allow you to choose a PDF file to open and convert to InDesign.