You will need to download the lightroom app (we recommend the mobile one. It is available for Android and iPhone).
When you purchase a lightroom preset you will receive a .DNG file. We prefer DNG files because they can be use in mobile and desktop.
A DNG file is a photo with a preset loaded. So our mission is to open the photo and save the preset so we can use it in other photos.
You have to open the DNG file in Lightroom, then open the settings menu and click on 'save preset'. That's all. But we know this can be a little tricky so we have made a video