To use printables you'll need a printer and paper or alternatively you can use a printing service.
How to print out the printables at home
1. Open the pdf file you purchased in a software that can read pdf-files. Couple example softwares you can use are Adobe Acrobat Reader or free Foxit PDF Reader.
2. Once you have opened the pdf file, click 'File' at top left corner and then choose 'Print'.
3. Choose pages you want to print.
4. Preview the result to ensure everything looks great.
5. Click print.