Follow steps 1 & 2 (pages 2 and 3) BEFORE downloading the mobile presets

Both of these apps are free. If Lightroom prompts you to pay for something, you clicked the wrong thing and will need to go back to the sign up page.

These instructions may look overwhelming but they are fairly simple.

Disclaimer: if you are not somewhat tech savy and have little patience for technology, mobile presets may not be the option for you