The stickers are packed into a ZIP file. Therefore you will need a program or app, such as Unzip, on your smartphone to open the file. Instructions can be found in the guide mentioned earlier. Do you prefer to use your computer? No worries, you can download the stickers, unzip them and transfer them to your smartphone.
All the story stickers you can find on this page are free. You can use them for private or commercial purposes. Please note that passing on the stickers (whether free of charge or with costs) is prohibited.